Dr. Ralf-Rainer Rohloff Profile

Dr. Ralf-Rainer Rohloff

Staff Engineer - Mechanical Design at Max-Planck-Institut für Astronomie

SPIE Involvement:

Author

Publications (83)

Proceedings Article | 30 July 2018

The MICADO first light imager for the ELT: overview, operation, simulation

R. Davies, J. Alves, Y. Clénet, F. Lang-Bardl, H. Nicklas, J.-U. Pott, R. Ragazzoni, E. Tolstoy, P. Amico, H. Anwand-Heerwart, S. Barboza, L. Barl, P. Baudoz, R. Bender, N. Bezawada, P. Bizenberger, W. Boland, P. Bonifacio, B. Borgo, T. Buey, F. Chapron, F. Chemla, M. Cohen, O. Czoske, V. Déo, K. Disseau, S. Dreizler, O. Dupuis, M. Fabricius, R. Falomo, P. Fedou, N. Förster Schreiber, V. Garrel, N. Geis, H. Gemperlein, E. Gendron, R. Genzel, S. Gillessen, M. Glück, F. Grupp, M. Hartl, M. Häuser, H.-J. Hess, R. Hofferbert, U. Hopp, V. Hörmann, Z. Hubert, E. Huby, J.-M. Huet, V. Hutterer, D. Ives, A. Janssen, W. Jellema, W. Kausch, F. Kerber, H. Kravcar, B. Le Ruyet, K. Leschinski, C. Mandla, M. Manhart, D. Massari, S. Mei, F. Merlin, L. Mohr, A. Monna, N. Muench, F. Müller, G. Musters, R. Navarro, U. Neumann, N. Neumayer, J. Niebsch, M. Plattner, N. Przybilla, S. Rabien, R. Ramlau, J. Ramos, S. Ramsay, P. Rhode, A. Richter, J. Richter, H.-W. Rix, G. Rodeghiero, R.-R. Rohloff, M. Rosensteiner, G. Rousset, J. Schlichter, J. Schubert, A. Sevin, R. Stuik, E. Sturm, J. Thomas, N. Tromp, G. Verdoes-Kleijn, F. Vidal, R. Wagner, M. Wegner, W. Zeilinger, J. Ziegleder, B. Ziegler, G. Zins

Proc. SPIE. 10702, Ground-based and Airborne Instrumentation for Astronomy VII

KEYWORDS: Adaptive optics, Distortion, Planets

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Proceedings Article | 27 July 2018 Presentation + Paper

CARMENES: high-resolution spectra and precise radial velocities in the red and infrared

A. Quirrenbach, P. Amado, I. Ribas, A. Reiners, J. Caballero, W. Seifert, J. Aceituno, M. Azzaro, D. Baroch, D. Barrado, F. Bauer, S. Becerril, V. J. S. Bèjar, D. Benítez, M. Brinkmöller, C. Cardona Guillén, C. Cifuentes, J. Colomé, M. Cortés-Contreras, S. Czesla, S. Dreizler, K. Frölich, B. Fuhrmeister, D. Galadí-Enríquez, J. González Hernández, R. González Peinado, E. Guenther, E. de Guindos, H.-J. Hagen, A. Hatzes, P. Hauschildt, J. Helmling, Th. Henning, O. Herbort, L. Hernández Castaño, E. Herrero, D. Hintz, S. Jeffers, E. Johnson, E. de Juan, A. Kaminski, H. Klahr, M. Kürster, M. Lafarga, L. Sairam, M. Lampón, L. M. Lara, R. Launhardt, M. López del Fresno, M. López-Puertas, R. Luque, H. Mandel, E. G. Marfil, E. Martín, S. Martín-Ruiz, R. Mathar, D. Montes, J. Morales, E. Nagel, L. Nortmann, G. Nowak, E. Pallé, V.-M. Passegger, A. Pavlov, S. Pedraz, D. Pérez-Medialdea, M. Perger, R. Rebolo, S. Reffert, E. Rodríguez, C. Rodríguez López, A. Rosich, S. Sabotta, S. Sadegi, M. Salz, A. Sánchez-López, J. Sanz-Forcada, P. Sarkis, S. Schäfer, J. Schiller, J. H. M. M. Schmitt, P. Schöfer, A. Schweitzer, D. Shulyak, E. Solano, O. Stahl, M. Tala Pinto, T. Trifonov, M. R. Zapatero Osorio, F. Yan, M. Zechmeister, F. Abellán, M. Abril, F. Alonso-Floriano, M. Ammler-von Eiff, G. Anglada-Escudé, H. Anwand-Heerwart, B. Arroyo-Torres, Z. Berdiñas, G. Bergondy, M. Blümcke, C. del Burgo, J. Cano, J. Carro, M. Cárdenas, E. Casal, A. Claret, E. Díez-Alonso, M. Doellinger, R. Dorda, C. Feiz, M. Fernández, I. Ferro, G. Gaisné, I. Gallardo, M. Gálvez-Ortiz, A. García-Piquer, M. L. García-Vargas, R. Garrido, L. Gesa, V. Gómez Galera, E. González-Álvarez, L. González-Cuesta, S. Grohnert, U. Grözinger, J. Guàrdia, A. Guijarro, R. P. Hedrosa, D. Hermann, I. Hermelo, R. Hernández Arabí, F. Hernández Hernando, D. Hidalgo, G. Holgado, A. Huber, K. Huber, P. Huke, M. Kehr, M. Kim, R. Klein, J. Klüter, A. Klutsch, F. Labarga, N. Labiche, A. Lamert, W. Laun, F. Lázaro, U. Lemke, R. Lenzen, M. Llamas, J.-L. Lizon, N. Lodieu, M. J. López González, M. López-Morales, J. F. López Salas, J. López-Santiago, H. Magán Madinabeitia, U. Mall, L. Mancini, J. A. Marín Molina, H. Martínez-Rodríguez, D. Maroto Fernández, C. Marvin, E. Mirabet, M. E. Moreno-Raya, A. Moya, R. Mundt, V. Naranjo, J. Panduro, J. Pascual, A. Pérez-Calpena, M. A. C. Perryman, M. Pluto, A. Ramón, P. Redondo, S. Reinhart, P. Rhode, H.-W. Rix, F. Rodler, R.-R. Rohloff, E. Sánchez-Blanco, M. Sánchez Carrasco, L. Sarmiento, C. Schmidt, C. Storz, J. B. P. Strachan, J. Stürmer, J. Suárez, H. Tabernero, L. Tal-Or, S. Tulloch, R.-G. Ulbrich, G. Veredas, J. Vico Linares, M. Vidal-Dasilva, F. Vilardell, K. Wagner, J. Winkler, V. Wolthoff, W. Xu, Z. Zhao

Proc. SPIE. 10702, Ground-based and Airborne Instrumentation for Astronomy VII

KEYWORDS: Optical fibers, Telescopes, Spectrographs, Astronomy, Stars, Calibration, Lamps, Infrared radiation, Sodium, Planets

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The design and construction of CARMENES has been presented at previous SPIE conferences. It is a next-generation radial-velocity instrument at the 3.5m telescope of the Calar Alto Observatory, which was built by a consortium of eleven Spanish and German institutions. CARMENES consists of two separate échelle spectrographs covering the wavelength range from 0.52 to 1.71μm at a spec-tral resolution of R < 80,000, fed by fibers from the Cassegrain focus of the telescope. CARMENES saw “First Light” on Nov 9, 2015. During the commissioning and initial operation phases, we established basic performance data such as throughput and spectral resolution. We found that our hollow-cathode lamps are suitable for precise wavelength calibration, but their spectra contain a number of lines of neon or argon that are so bright that the lamps cannot be used in simultaneous exposures with stars. We have therefore adopted a calibration procedure that uses simultaneous star / Fabry Pérot etalon exposures in combination with a cross-calibration between the etalons and hollow-cathode lamps during daytime. With this strategy it has been possible to achieve 1-2 m/s precision in the visible and 5-10 m/s precision in the near-IR; further improvements are expected from ongoing work on temperature control, calibration procedures and data reduction. Comparing the RV precision achieved in different wavelength bands, we find a “sweet spot” between 0.7 and 0.8μm, where deep TiO bands provide rich RV information in mid-M dwarfs. This is in contrast to our pre-survey models, which predicted comparatively better performance in the near-IR around 1μm, and explains in part why our near-IR RVs do not reach the same precision level as those taken with the visible spectrograph. We are now conducting a large survey of 340 nearby M dwarfs (with an average distance of only 12pc), with the goal of finding terrestrial planets in their habitable zones. We have detected the signatures of several previously known or suspected planets and also discovered several new planets. We find that the radial velocity periodograms of many M dwarfs show several significant peaks. The development of robust methods to distinguish planet signatures from activity-induced radial velocity jitter is therefore among our priorities. Due to its large wavelength coverage, the CARMENES survey is generating a unique data set for studies of M star atmospheres, rotation, and activity. The spectra cover important diagnostic lines for activity (H alpha, Na I D1 and D2, and the Ca II infrared triplet), as well as FeH lines, from which the magnetic field can be inferred. Correlating the time series of these features with each other, and with wavelength-dependent radial velocities, provides excellent handles for the discrimination between planetary companions and stellar radial velocity jitter. These data are also generating new insight into the physical properties of M dwarf atmospheres, and the impact of activity and flares on the habitability of M star planets.

Proceedings Article | 11 July 2018 Paper

The MICADO first light imager for ELT: derotator design status and prototype results

Santiago Barboza, Jörg-Uwe Pott, Ralf-Rainer Rohloff, Friedrich Müller, Ralph Hofferbert, Norbert Münch, Lars Mohr, José Ramos, Monica Ebert, Martin Glück, Jörg Wagner, Hans Kärcher, Wolfram Schlossmacher, Maximilian Häberle

Proc. SPIE. 10702, Ground-based and Airborne Instrumentation for Astronomy VII

KEYWORDS: Mathematical modeling, Interfaces, Manufacturing, Finite element methods, Computer aided design, Systems modeling, Prototyping

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Proceedings Article | 11 July 2018 Paper

The MICADO first light imager for the ELT: preliminary design of the MICADO Calibration Assembly

G. Rodeghiero, J.-U. Pott, N. Münch, R.-R. Rohloff, U. Grözinger, E. Biancalani, M. Sawczuck, M. Häberle, J. Moreno-Ventas, S. Schäfer, U. Seemann, V. Naranjo, S. Barboza, F. Müller, R. Hofferbert, J. Ramos, L. Mohr, M. C. Cárdenas Vázquez, P. Bizenberger, C. Pernechele, M. Ebert, M. Fabricius

Proc. SPIE. 10702, Ground-based and Airborne Instrumentation for Astronomy VII

KEYWORDS: Telescopes, Mirrors, Light sources, Sensors, Calibration, Manufacturing, Lamps, Imaging spectroscopy, Adaptive optics, Prototyping

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Proceedings Article | 10 July 2018 Paper

Single conjugate adaptive optics for METIS

Thomas Bertram, Olivier Absil, Peter Bizenberger, Wolfgang Brandner, Florian Briegel, Faustine Cantalloube, Brunella Carlomagno, María Concepción Cárdenas Vázquez, Markus Feldt, Adrian Glauser, Thomas Henning, Stefan Hippler, Armin Huber, Norma Hurtado, Matthew Kenworthy, Martin Kulas, Lars Mohr, Vianak Naranjo, Philip Neureuther, Andreas Obereder, Ralf-Rainer Rohloff, Silvia Scheithauer, Iuliia Shatokhina, Remko Stuik, Roy van Boekel

Proc. SPIE. 10703, Adaptive Optics Systems VI

KEYWORDS: Actuators, Mirrors, Wavefront sensors, Wavefronts, Adaptive optics, Control systems, Modulators, Real-time computing

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Proceedings Article | 17 November 2017

Athermal metal optics made of nickel plated AlSi40

Andreas Gebhardt, Jan Kinast, Ralf-Rainer Rohloff, Walter Seifert, Matthias Beier, Sebastian Scheiding, Thomas Peschel

Proc. SPIE. 10563, International Conference on Space Optics — ICSO 2014

KEYWORDS: Mirrors, Polishing, Nickel, Silicon, Manufacturing, Aluminum, Astronomical imaging, Metal optics, Optics manufacturing, Cryogenics

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Metal optics is an inherent part of space instrumentation for years. Diamond turned aluminum (Al6061) mirrors are widely used for application in the mid- and near-infrared (mid-IR and NIR, respectively) spectral range. Aluminum mirrors plated with electroless nickel (NiP) expand the field of application towards multispectral operating instruments down to the ultraviolet wavelengths. Due to the significant mismatch in the coefficient of thermal expansion (CTE) between aluminum and NiP, however, this advantage occurs at the cost of bimetallic bending. Challenging requirements can be met by using bare beryllium or aluminum beryllium composites (AlBeMet) as a CTE tailored substrate material and amorphous NiP as polishable layer. For health reasons, the use of beryllium causes complications in the process chain. Thus, the beryllium approach is subjected to specific applications only. Metal optics has proven to be advantageous in respect of using conventional CNC and ultra-precision fabrication methods to realize complex and light-weighted instrument structures. Moreover, the mirror designs can be effectively optimized for a deterministic system assembly and optimization. Limitations in terms of dimensional stability over temperature and time are mainly given by the inherent material properties (figures of merit) of the substrate material in interaction with the polishing layer.

To find an optimal compromise, a thermal matched aluminum-silicon alloy (silicon contents ≈ 40 wt%) plated with NiP (AlSi40/NiP ) was investigated in a joined project of the Max Planck Institute for Astronomy MPIA and the Fraunhofer Institute for Applied Optics and Precision Engineering IOF. The main tasks of the project were the minimization of the bimetallic bending, the development of reliable stabilizing and aging procedures, and the establishment of a proven fabrication method.

This paper describes fundamental results regarding the optimization of the athermal material combination. Furthermore, the developed production chain for high quality freeform mirrors made of AlSi40/NiP is pointed out.

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Proceedings Article | 17 November 2017

Dimensional stability of metal optics on nickel plated AlSi40

Jan Kinast, Kevin Grabowski, Ralf-Rainer Rohloff, Stefan Risse, Andreas Tünnermann

Proc. SPIE. 10563, International Conference on Space Optics — ICSO 2014

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Proceedings Article | 17 November 2016 Paper

CARMENES: an overview six months after first light

A. Quirrenbach, P. Amado, J. Caballero, R. Mundt, A. Reiners, I. Ribas, W. Seifert, M. Abril, J. Aceituno, F. Alonso-Floriano, H. Anwand-Heerwart, M. Azzaro, F. Bauer, D. Barrado, S. Becerril, V. J. Bejar, D. Benitez, Z. Berdinas, M. Brinkmöller, M. Cardenas, E. Casal, A. Claret, J. Colomé, M. Cortes-Contreras, S. Czesla, M. Doellinger, S. Dreizler, C. Feiz, M. Fernandez, I. Ferro, B. Fuhrmeister, D. Galadi, I. Gallardo, M. Gálvez-Ortiz, A. Garcia-Piquer, R. Garrido, L. Gesa, V. Gómez Galera, J. González Hernández, R. Gonzalez Peinado, U. Grözinger, J. Guàrdia, E. Guenther, E. de Guindos, H.-J. Hagen, A. Hatzes, P. Hauschildt, J. Helmling, T. Henning, D. Hermann, R. Hernández Arabi, L. Hernández Castaño, F. Hernández Hernando, E. Herrero, A. Huber, K. Huber, P. Huke, S. Jeffers, E. de Juan, A. Kaminski, M. Kehr, M. Kim, R. Klein, J. Klüter, M. Kürster, M. Lafarga, L. Lara, A. Lamert, W. Laun, R. Launhardt, U. Lemke, R. Lenzen, M. Llamas, M. Lopez del Fresno, M. López-Puertas, J. López-Santiago, J. Lopez Salas, H. Magan Madinabeitia, U. Mall, H. Mandel, L. Mancini, J. Marin Molina, D. Maroto Fernández, E. Martín, S. Martín-Ruiz, C. Marvin, R. Mathar, E. Mirabet, D. Montes, J. Morales, R. Morales Muñoz, E. Nagel, V. Naranjo, G. Nowak, E. Palle, J. Panduro, V. Passegger, A. Pavlov, S. Pedraz, E. Perez, D. Pérez-Medialdea, M. Perger, M. Pluto, A. Ramón , R. Rebolo, P. Redondo, S. Reffert, S. Reinhart, P. Rhode, H.-W. Rix, F. Rodler, E. Rodríguez, C. Rodríguez López, R. Rohloff, A. Rosich, M Sanchez Carrasco, J. Sanz-Forcada, P. Sarkis, L. Sarmiento, S. Schäfer, J. Schiller, C. Schmidt, J. H. M. M. Schmitt, P. Schöfer, A. Schweitzer, D. Shulyak, E. Solano, O. Stahl, C. Storz, H. Tabernero, M. Tala, L. Tal-Or, R.-G. Ulbrich, G. Veredas, J. I. Vico Linares, F. Vilardell, K. Wagner, J. Winkler, M.-R. Zapatero Osorio, M. Zechmeister, M. Ammler-von Eiff, G. Anglada-Escudé, C. del Burgo, M. Garcia-Vargas, A. Klutsch, J.-L. Lizon, M. Lopez-Morales, A. Ofir, A. Pérez-Calpena, M. A. C. Perryman, E. Sánchez-Blanco , J. B. P. Strachan, J. Stürmer, J. Suárez, T. Trifonov, S. Tulloch, W. Xu

Proc. SPIE. 9908, Ground-based and Airborne Instrumentation for Astronomy VI

KEYWORDS: Observatories, Telescopes, Spectrographs, Fabry–Perot interferometers, Stars, Calibration, Lamps, Control systems, Data archive systems, Planets

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Proceedings Article | 9 August 2016

MICADO: first light imager for the E-ELT

R. Davies, J. Schubert, M. Hartl, J. Alves, Y. Clénet, F. Lang-Bardl, H. Nicklas, J.-U. Pott, R. Ragazzoni, E. Tolstoy, T. Agocs, H. Anwand-Heerwart, S. Barboza, P. Baudoz, R. Bender, P. Bizenberger, A. Boccaletti, W. Boland, P. Bonifacio, F. Briegel, T. Buey, F. Chapron, M. Cohen, O. Czoske, S. Dreizler, R. Falomo, P. Feautrier, N. Förster Schreiber, E. Gendron, R. Genzel, M. Glück, D. Gratadour, R. Greimel, F. Grupp, M. Häuser, M. Haug, J. Hennawi, H. J. Hess, V. Hörmann, R. Hofferbert, U. Hopp, Z. Hubert, D. Ives, W. Kausch, F. Kerber, H. Kravcar, K. Kuijken, M. Leitzinger, K. Leschinski, D. Massari, S. Mei, F. Merlin, L. Mohr, A. Monna, F. Müller, R. Navarro, M. Plattner, N. Przybilla, R. Ramlau, S. Ramsay, T. Ratzka, P. Rhode, J. Richter, H.-W. Rix, G. Rodeghiero, R.-R. Rohloff, G. Rousset, R. Ruddenklau, V. Schaffenroth, J. Schlichter, A. Sevin, R. Stuik, E. Sturm, J. Thomas, N. Tromp, M. Turatto, G. Verdoes-Kleijn, F. Vidal, R. Wagner, M. Wegner, W. Zeilinger, B. Ziegler, G. Zins

Proc. SPIE. 9908, Ground-based and Airborne Instrumentation for Astronomy VI

KEYWORDS: Mirrors, Stars, Cameras, Cameras, Sensors, Spectroscopy, Interfaces, Imaging spectroscopy, Adaptive optics, Adaptive optics, Zoom lenses, Galactic astronomy

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Proceedings Article | 9 August 2016 Paper

Design of a large image derotator for the E-ELT instrument MICADO

Santiago Barboza, Jörg-Uwe Pott, Ralf-Rainer Rohloff, Friedrich Müller, Jörg Wagner, Hans Kärcher

Proc. SPIE. 9908, Ground-based and Airborne Instrumentation for Astronomy VI

KEYWORDS: Mathematical modeling, Telescopes, Interfaces, Magnetism, Wavefront sensors, Adaptive optics, Computer programming, Finite element methods, Large telescopes, Device simulation

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Proceedings Article | 27 July 2016 Paper

System tests and on-sky commissioning of the GRAVITY-CIAO wavefront sensors

C. Deen, J. Kolb, S. Oberti, H. Bonnet, E. Müller, Z. Hubert, G. Zins, F. Delplancke, P. Haguenauer, L. Pettazzi, P. Bourget, M. Suarez-Valles, S. Scheithauer, A. Huber, M. Esselborn, Y. Clenét, E. Gendron, W. Brandner, R. Klein, R. Lenzen, Udo Neumann, M. Kulas, J. Panduro, J. Ramos, R.-R. Rohloff, T. Henning, K. Perraut, G. Perrin, C. Straubmeier, A. Amorim, F. Eisenhauer

Proc. SPIE. 9909, Adaptive Optics Systems V

KEYWORDS: Telescopes, Mirrors, Stars, Matrices, Wavefront sensors, Adaptive optics, Control systems, Infrared radiation, Shape memory alloys, Mendelevium

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Proceedings Article | 27 July 2016 Paper

CIAO: wavefront sensors for GRAVITY

Silvia Scheithauer, Wolfgang Brandner, Casey Deen, Tobias Adler, Henri Bonnet, Pierre Bourget, Fanny Chemla, Yann Clenet, Francoise Delplancke, Monica Ebert, Frank Eisenhauer, Michael Esselborn, Gert Finger, Eric Gendron, Adrian Glauser, Frederic Gonte, Thomas Henning, Stefan Hippler, Armin Huber, Zoltan Hubert, Gerd Jakob, Lieselotte Jochum, Laurent Jocou, Sarah Kendrew, Ralf Klein, Johann Kolb, Martin Kulas, Werner Laun, Rainer Lenzen, Marcus Mellein, Eric Müller, Javier Moreno-Ventas, Udo Neumann, Sylvain Oberti, Jürgen Ott, Laurent Pallanca, Johana Panduro, Jose Ramos, Miguel Riquelme, Ralf-Rainer Rohloff, Gérard Rousset, Nicolas Schuhler, Marcos Suarez, Gerard Zins

Proc. SPIE. 9909, Adaptive Optics Systems V

KEYWORDS: Infrared sensors, Observatories, Telescopes, Mirrors, Stars, Sensors, Wavefront sensors, Wavefront sensors, Adaptive optics, Infrared radiation, Infrared telescopes, Infrared telescopes

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Proceedings Article | 7 August 2014 Paper

Integration and bench testing for the GRAVITY Coudé IR adaptive optics (CIAO) wavefront sensor

C. Deen, P. Yang, A. Huber, M. Suarez-Valles, S. Hippler, W. Brandner, E. Gendron, Y. Clénet, S. Kendrew, A. Glauser, R. Klein, W. Laun, R. Lenzen, U. Neumann, J. Panduro, J. Ramos, R.-R. Rohloff, A. Salzinger, N. Zimmerman, T. Henning, K. Perraut, G. Perrin, C. Straubmeier, A. Amorim, F. Eisenhauer

Proc. SPIE. 9148, Adaptive Optics Systems IV

KEYWORDS: Infrared sensors, Telescopes, Mirrors, Sensors, Computing systems, Wavefront sensors, Adaptive optics, Deformable mirrors, Infrared radiation, Real-time computing

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Proceedings Article | 18 July 2014 Paper

Minimizing the bimetallic bending for cryogenic metal optics based on electroless nickel

Jan Kinast, Enrico Hilpert, Nicolas Lange, Andreas Gebhardt, Ralf-Rainer Rohloff, Stefan Risse, Ramona Eberhardt, Andreas Tünnermann

Proc. SPIE. 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation

KEYWORDS: Mirrors, Polishing, Nickel, Silicon, Interferometry, Aluminum, Phosphorus, Magnetorheological finishing, Cryogenics, Temperature metrology

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Proceedings Article | 10 July 2014 Paper

CARMENES instrument overview

A. Quirrenbach, P. Amado, J. Caballero, R. Mundt, A. Reiners, I. Ribas, W. Seifert, M. Abril, J. Aceituno, F. J. Alonso-Floriano, M. Ammler-von Eiff, R. Antona Jiménez, H. Anwand-Heerwart, M. Azzaro, F. Bauer, D. Barrado, S. Becerril, V. J. Béjar, D. Benítez, Z. Berdiñas, M. Cárdenas, E. Casal, A. Claret, J. Colomé, M. Cortés-Contreras, S. Czesla, M. Doellinger, S. Dreizler, C. Feiz, M. Fernández, D. Galadí, M. Gálvez-Ortiz, A. García-Piquer, M. García-Vargas, R. Garrido, L. Gesa, V. Gómez Galera, E. González Álvarez, J. González Hernández, U. Grözinger, J. Guàrdia, E. Guenther, E. de Guindos, J. Gutiérrez-Soto, H.-J. Hagen, A. Hatzes, P. Hauschildt, J. Helmling, T. Henning, D. Hermann, L. Hernández Castaño, E. Herrero, D. Hidalgo, G. Holgado, A. Huber, K. Huber, S. Jeffers, V. Joergens, E. de Juan, M. Kehr, R. Klein, M. Kürster, A. Lamert, S. Lalitha, W. Laun, U. Lemke, R. Lenzen, Mauro López del Fresno, B. López Martí, J. López-Santiago, U. Mall, H. Mandel, E. Martín, S. Martín-Ruiz, H. Martínez-Rodríguez, C. Marvin, R. Mathar, E. Mirabet, D. Montes, R. Morales Muñoz, A. Moya, V. Naranjo, A. Ofir, R. Oreiro, E. Pallé, J. Panduro, V.-M. Passegger, A. Pérez-Calpena, D. Pérez Medialdea, M. Perger, M. Pluto, A. Ramón, R. Rebolo, P. Redondo, S. Reffert, S. Reinhardt, P. Rhode, H.-W. Rix, F. Rodler, E. Rodríguez, C. Rodríguez-López, E. Rodríguez-Pérez, R.-R. Rohloff, A. Rosich, E. Sánchez-Blanco, M. Sánchez Carrasco, J. Sanz-Forcada, L. Sarmiento, S. Schäfer, J. Schiller, C. Schmidt, J. H. M. M. Schmitt, E. Solano, O. Stahl, C. Storz, J. Stürmer, J. Suárez, R. Ulbrich, G. Veredas, K. Wagner, J. Winkler, M. Zapatero Osorio, M. Zechmeister, F. Abellán de Paco, G. Anglada-Escudé, C. del Burgo, A. Klutsch, J. Lizon, M. López-Morales, J. Morales, M. A. C. Perryman, S. Tulloch, W. Xu

Proc. SPIE. 9147, Ground-based and Airborne Instrumentation for Astronomy V

KEYWORDS: Optical fibers, Telescopes, Spectrographs, Visible radiation, Stars, Sensors, Calibration, Lamps, Exoplanets, Planets

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This paper gives an overview of the CARMENES instrument and of the survey that will be carried out with it during the first years of operation. CARMENES (Calar Alto high-Resolution search for M dwarfs with Exoearths with Near-infrared and optical Echelle Spectrographs) is a next-generation radial-velocity instrument under construction for the 3.5m telescope at the Calar Alto Observatory by a consortium of eleven Spanish and German institutions. The scientific goal of the project is conducting a 600-night exoplanet survey targeting ~ 300 M dwarfs with the completed instrument. The CARMENES instrument consists of two separate echelle spectrographs covering the wavelength range from 0.55 to 1.7 μm at a spectral resolution of R = 82,000, fed by fibers from the Cassegrain focus of the telescope. The spectrographs are housed in vacuum tanks providing the temperature-stabilized environments necessary to enable a 1 m/s radial velocity precision employing a simultaneous calibration with an emission-line lamp or with a Fabry-Perot etalon. For mid-M to late-M spectral types, the wavelength range around 1.0 μm (Y band) is the most important wavelength region for radial velocity work. Therefore, the efficiency of CARMENES has been optimized in this range. The CARMENES instrument consists of two spectrographs, one equipped with a 4k x 4k pixel CCD for the range 0.55 - 1.05 μm, and one with two 2k x 2k pixel HgCdTe detectors for the range from 0.95 - 1.7μm. Each spectrograph will be coupled to the 3.5m telescope with two optical fibers, one for the target, and one for calibration light. The front end contains a dichroic beam splitter and an atmospheric dispersion corrector, to feed the light into the fibers leading to the spectrographs. Guiding is performed with a separate camera; on-axis as well as off-axis guiding modes are implemented. Fibers with octagonal cross-section are employed to ensure good stability of the output in the presence of residual guiding errors. The fibers are continually actuated to reduce modal noise. The spectrographs are mounted on benches inside vacuum tanks located in the coud´e laboratory of the 3.5m dome. Each vacuum tank is equipped with a temperature stabilization system capable of keeping the temperature constant to within ±0.01°C over 24 hours. The visible-light spectrograph will be operated near room temperature, while the near-IR spectrograph will be cooled to ~ 140 K. The CARMENES instrument passed its final design review in February 2013. The MAIV phase is currently ongoing. First tests at the telescope are scheduled for early 2015. Completion of the full instrument is planned for the fall of 2015. At least 600 useable nights have been allocated at the Calar Alto 3.5m Telescope for the CARMENES survey in the time frame until 2018. A data base of M stars (dubbed CARMENCITA) has been compiled from which the CARMENES sample can be selected. CARMENCITA contains information on all relevant properties of the potential targets. Dedicated imaging, photometric, and spectroscopic observations are underway to provide crucial data on these stars that are not available in the literature.

Proceedings Article | 8 July 2014 Paper

PANIC in the lab: status before commissioning

Bernhard Dorner, Armin Huber, M. Concepcion Cárdenas Vázquez, Irene Ferro Rodriguez, Peter Bizenberger, Vianak Naranjo, Johana Panduro, Ulrich Mall, Matthias Alter, Richard Mathar, Clemens Storz, Ralf-Rainer Rohloff, Patrick Fopp, Werner Laun, José Miguel Ibáñez, Antonio García Segura, Víctor Terrón, Josef Fried, Matilde Fernández, Julio Rodríguez Gómez, Klaus Meisenheimer

Proc. SPIE. 9147, Ground-based and Airborne Instrumentation for Astronomy V

KEYWORDS: Staring arrays, Optical components, Telescopes, Optical filters, Mirrors, Sensors, Interfaces, Optical benches, Optical alignment, Tolerancing

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SPIE Journal Paper | 6 February 2013

LINC-NIRVANA for the large binocular telescope: setting up the world’s largest near infrared binoculars for astronomy

Ralph Hofferbert, Harald Baumeister, Thomas Bertram, Jürgen Berwein, Peter Bizenberger, Armin Böhm, Michael Böhm, José Luis Borelli, Matthieu Brangier, Florian Briegel, Albert Conrad, Fulvio De Bonis, Roman Follert, Thomas Herbst, Armin Huber, Frank Kittmann, Martin Kürster, Werner Laun, Ulrich Mall, Daniel Meschke, Lars Mohr, Vianak Naranjo, Aleksei Pavlov, Jorg-Uwe Pott, Hans-Walter Rix, Ralf-Rainer Rohloff, Eva Schinnerer, Clemens Storz, Jan Trowitzsch, Zhaojun Yan, Xianyu Zhang, Andreas Eckart, Matthew Horrobin, Steffen Rost, Christian Straubmeier, Imke Wank, Jens Zuther, Udo Beckmann, Claus Connot, Matthias Heininger, Karl-Heinz Hofmann, Tim Kroner, Edmund Nussbaum, Dieter Schertl, Gerd Weigelt, Maria Bergomi, Alessandro Brunelli, Marco Dima, Jacopo Farinato, Demetrio Magrin, Luca Marafatto, Roberto Ragazzoni, Valentina Viotto, Carmelo Arcidiacono, Giovanni Bregoli, Paolo Ciliegi, Giuseppe Cosentino, Emiliano Diolaiti, Italo Foppiani, Matteo Lombini, Laura Schreiber, Francesco D'Alessio, Gianluca Li Causi, Dario Lorenzetti, Fabrizio Vitali, Mario Bertero, Patrizia Boccacci, Andrea La Camera

OE Vol. 52 Issue 08

KEYWORDS: Telescopes, Sensors, Mirrors, Interferometry, Near infrared, Adaptive optics, Interfaces, Cameras, Optical engineering, Astronomy

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Proceedings Article | 24 October 2012 Paper

LINC-NIRVANA for the LBT: setting up the world's largest NIR binoculars for astronomy

Ralph Hofferbert, Harald Baumeister, Thomas Bertram, Jürgen Berwein, Peter Bizenberger, Armin Böhm, Michael Böhm, José Luis Borelli, Matthieu Brangier, Florian Briegel, Albert Conrad, Fulvio De Bonis, Roman Follert, Tom Herbst, Armin Huber, Frank Kittmann, Martin Kürster, Werner Laun, Ulrich Mall, Daniel Meschke, Lars Mohr, Vianak Naranjo, Aleksei Pavlov, Jörg-Uwe Pott, Hans-Walter Rix, Ralf-Rainer Rohloff, Eva Schinnerer, Clemens Storz, Jan Trowitzsch, Zhaojun Yan, Xianyu Zhang, Andreas Eckart, Matthew Horrobin, Steffen Rost, Christian Straubmeier, Imke Wank, Jens Zuther, Udo Beckmann, Claus Connot, Matthias Heininger, Karl-Heinz Hofmann, Tim Kröner, Eddy Nussbaum, Dieter Schertl, Gerd Weigelt, Maria Bergomi, Alessandro Brunelli, Marco Dima, Jacopo Farinato, Demetrio Magrin, Luca Marafatto, Roberto Ragazzoni, Valentina Viotto, Carmelo Arcidiacono, Giovanni Bregoli, Paolo Ciliegi, Guiseppe Cosentino, Emiliano Diolaiti, Italo Foppiani, Matteo Lombini, Laura Schreiber, Francesco D'Alessio, Gianluca Li Causi, Dario Lorenzetti, Fabrizio Vitali, Mario Bertero, Patrizia Boccacci, Andrea La Camera

Proc. SPIE. 8511, Infrared Remote Sensing and Instrumentation XX

KEYWORDS: Near infrared, Telescopes, Mirrors, Stars, Imaging systems, Cameras, Sensors, Interfaces, Interferometry, Adaptive optics

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Proceedings Article | 5 October 2012 Paper

CARMENES. I: instrument and survey overview

Andreas Quirrenbach, Pedro Amado, Walter Seifert, Miguel Sánchez Carrasco, Holger Mandel, Jose Caballero, Reinhard Mundt, Ignasi Ribas, Ansgar Reiners, Miguel Abril, Jesus Aceituno, Javier Alonso-Floriano, Matthias Ammler-von Eiff, Guillem Anglada-Escude, Regina Antona Jiménez, Heiko Anwand-Heerwart, David Barrado y Navascués, Santiago Becerril, Victor Bejar, Daniel Benitez, Concepcion Cardenas, Antonio Claret, Josep Colome, Miriam Cortés-Contreras, Stefan Czesla, Carlos del Burgo, Michaela Doellinger, R. Dorda, Stefan Dreizler, Carmen Feiz, Matilde Fernandez, David Galadi, Rafael Garrido, Jonay González Hernández, Josep Guardia, Eike Guenther, Enrique de Guindos, Juan Gutiérrez-Soto, Hans Hagen, Artie Hatzes, Peter Hauschildt, Jens Helmling, Thomas Henning, Enrique Herrero, Armin Huber, Klaus Huber, Sandra Jeffers, Viki Joergens, Enrique de Juan, M. Kehr, Alexis Klutsch, Martin Kürster, S. Lalitha, Werner Laun, Ulrike Lemke, Rainer Lenzen, Jean-Louis Lizon, Mauro López del Fresno, Mercedes López-Morales, Javier López-Santiago, Ulrich Mall, Eduardo Martin, Susana Martín-Ruiz, Eduard Mirabet, David Montes, Juan Carlos Morales, Rafael Morales Muñoz, Andres Moya, Vianak Naranjo, Raquel Oreiro, David Pérez Medialdea, Michael Pluto, Ovidio Rabaza, Alejandro Ramon, Rafael Rebolo, Sabine Reffert, Petra Rhode, Hans-Walter Rix, Florian Rodler, Eloy Rodríguez, Cristina Rodríguez López, Emilio Rodríguez Pérez, A. Rodriguez Trinidad, Ralf-Reiner Rohloff, Ernesto Sánchez-Blanco, Jorge Sanz-Forcada, Sebastian Schäfer, Jörg Schiller, Christof Schmidt, Jürgen Schmitt, Enrique Solano, Otmar Stahl, Clemens Storz, Julian Stürmer, Juan Carlos Suarez, Ulrich Thiele, Rainer Ulbrich, Manuela Vidal-Dasilva, Karl Wagner, Johannes Winkler, Wenli Xu, Maria Rosa Zapatero Osorio, Mathias Zechmeister

Proc. SPIE. 8446, Ground-based and Airborne Instrumentation for Astronomy IV

KEYWORDS: Optical fibers, Near infrared, Telescopes, Spectrographs, Stars, Sensors, Calibration, Lamps, Exoplanets, Planets

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Proceedings Article | 24 September 2012 Paper

The GRAVITY Coudé Infrared Adaptive Optics (CIAO) system for the VLT Interferometer

S. Kendrew, S. Hippler, W. Brandner, Y. Clénet, C. Deen, E. Gendron, A. Huber, R. Klein, W. Laun, R. Lenzen, V. Naranjo, Udo Neumann, J. Ramos, R.-R. Rohloff, P. Yang, F. Eisenhauer, A. Amorim, K. Perraut, G. Perrin, C. Straubmeier, Enrico Fedrigo, Marcos Suarez Valles

Proc. SPIE. 8446, Ground-based and Airborne Instrumentation for Astronomy IV

KEYWORDS: Near infrared, Telescopes, Stars, Interferometers, Sensors, Wavefront sensors, Wavefronts, Adaptive optics, Monte Carlo methods, Infrared radiation

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Proceedings Article | 21 September 2012 Paper

Visible/infrared spectrometer for EChO

O. Krause, A. Glauser, R. van Boekel, M. Güdel, T. Henning, M. Meyer, D. Stam, B. Vandenbussche, U. Grözinger, U. Klaas, R. Lenzen, F. Müller, R. Ottensamer, S. Quanz, E. Renotte, R.-R. Rohloff, H.-M. Schmid, J.-R. Schrader, U. Wehmeier

Proc. SPIE. 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave

KEYWORDS: Thermography, Signal to noise ratio, Telescopes, Mirrors, Sensors, Calibration, Spectroscopy, Exoplanets, Infrared spectroscopy, Space telescopes

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Proceedings Article | 13 September 2012 Paper

Aligning a more than 100 degrees of freedom wavefront sensor

Luca Marafatto, Maria Bergomi, Alessandro Brunelli, Marco Dima, Jacopo Farinato, Giancarlo Farisato, Luigi Lessio, Demetrio Magrin, Roberto Ragazzoni, Valentina Viotto, Thomas Bertram, Peter Bizenberger, Matthieu Brangier, Florian Briegel, Albert Conrad, Fulvio De Bonis, Tom Herbst, Ralph Hofferbert, Frank Kittmann, Martin Kürster, Daniel Meschke, Lars Mohr, Ralf-Rainer Rohloff

Proc. SPIE. 8447, Adaptive Optics Systems III

KEYWORDS: Superposition, Optical components, Mirrors, Beam splitters, Stars, Sensors, Wavefront sensors, Collimation, Charge-coupled devices, Selenium

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Proceedings Article | 13 September 2012 Paper

LINC-NIRVANA Pathfinder: testing the next generation of wave front sensors at LBT

Albert Conrad, Carmelo Arcidiacono, Harald Baumeister, Maria Bergomi, Thomas Bertram, Juergen Berwein, Chris Biddick, Peter Bizenberger, Matthieu Brangier, Florian Briegel, Alessandro Brunelli, Joar Brynnel, Lorenzo Busoni, Norm Cushing, Fulvio De Bonis, Michele De La Pena, Simone Esposito, Jacopo Farinato, Luca Fini, Richard Green, Tom Herbst, Ralph Hofferbert, Frank Kittmann, Martin Kuerster, Werner Laun, Daniel Meschke, Lars Mohr, Aleksei Pavlov, Jorg-Uwe Pott, Alfio Puglisi, Roberto Ragazzoni, Andrew Rakich, Ralf-Rainer Rohloff, Jan Trowitzsch, Valentina Viotto, Xianyu Zhang

Proc. SPIE. 8447, Adaptive Optics Systems III

KEYWORDS: Infrared cameras, Mirrors, Stars, Cameras, Calibration, Wavefront sensors, Wavefronts, Adaptive optics, CCD cameras, Charge-coupled devices

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Proceedings Article | 13 September 2012 Paper

High stability piezomotor driven mirror mounts for LINC-NIRVANA

A. Bramigk, H. Marth, R.-R. Rohloff

Proc. SPIE. 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II

KEYWORDS: Actuators, Optical filters, Mirrors, Visible radiation, Beam splitters, Sensors, Computer programming, Autocollimators, Computer aided design, Mirror mounts

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Proceedings Article | 12 September 2012 Paper

Optimizing the transmission of the GRAVITY/VLTI near-infrared wavefront sensor

Pengqian Yang, Stefan Hippler, Casey Deen, Armin Böhm, Wolfgang Brandner, Thomas Henning, Armin Huber, Sarah Kendrew, Rainer Lenzen, Ralf-Rainer Rohloff, Constanza Araujo-Hauck, Oliver Pfuhl, Yann Clénet, Jianqiang Zhu

Proc. SPIE. 8445, Optical and Infrared Interferometry III

KEYWORDS: Telescopes, Optical filters, Metrology, Interferometers, Interferometry, Wavefront sensors, Wavefronts, Adaptive optics, Optical testing, Laser metrology

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Proceedings Article | 17 September 2010 Paper

Manufacturing and integration of the IRDIS dual imaging camera and spectrograph for SPHERE

Kjetil Dohlen, Michael Carle, Fabrice Madec, Maud Langlois, David Le Mignant, Michel Saisse, Arthur Vigan, Gilles Arthaud, Rudy Barette, Jean-Antoine Benedetti, Jean-Claude Blanc, Patrick Blanchard, William Bon, Louis Castinel, Christophe Fabron, Lucien Hill, Marc Jaquet, Philippe Laurent, Marc Llored, Nataly Manzone, Silvio Mazzanti, Jeanne Melkonian, Gabriel Moreaux, Claire Moutou, Alain Origne, Markus Feldt, Vianak Naranjo, Ralf-Rainer Rohloff, Jean-Luc Beuzit, Laurence Gluck, David Mouillet, Pascal Puget, Andrea Baruffolo, Francois Wildi, Reinhold Dorn, Gert Finger, Norbert Hubin, Markus Kasper, Jean-Louis Lizon

Proc. SPIE. 7735, Ground-based and Airborne Instrumentation for Astronomy III

KEYWORDS: Optical filters, Optical spheres, Cameras, Sensors, Manufacturing, Imaging spectroscopy, Coronagraphy, Image filtering, Optical benches, Optics manufacturing

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Proceedings Article | 22 July 2010

GRAVITY: a four telescope beam combiner instrument for the VLTI

S. Gillessen, F. Eisenhauer, G. Perrin, W. Brandner, C. Straubmeier, K. Perraut, A. Amorim, M. Schöller, C. Araujo-Hauck, H. Bartko, H. Baumeister, J.-P. Berger, P. Carvas, F. Cassaing, F. Chapron, E. Choquet, Y. Clenet, C. Collin, A. Eckart, P. Fedou, S. Fischer, E. Gendron, R. Genzel, P. Gitton, F. Gonte, A. Gräter, P. Haguenauer, M. Haug, X. Haubois, T. Henning, S. Hippler, R. Hofmann, L. Jocou, S. Kellner, P. Kervella, R. Klein, N. Kudryavtseva, S. Lacour, V. Lapeyrere, W. Laun, P. Lena, R. Lenzen, J. Lima, D. Moratschke, D. Moch, T. Moulin, V. Naranjo, U. Neumann, A. Nolot, T. Paumard, O. Pfuhl, S. Rabien, J. Ramos, J. Rees, R.-R. Rohloff, D. Rouan, G. Rousset, A. Sevin, M. Thiel, K. Wagner, M. Wiest, S. Yazici, D. Ziegler

Proc. SPIE. 7734, Optical and Infrared Interferometry II

KEYWORDS: Near infrared, Telescopes, Metrology, Stars, Sensors, Spectroscopy, Interferometry, Wavefront sensors, Adaptive optics, Integrated optics

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Proceedings Article | 22 July 2010 Paper

LINC-NIRVANA piston control elements

Mario Brix, Jörg-Uwe Pott, Thomas Bertram, Steffen Rost, Jose Luis Borelli, Thomas Herbst, Martin Kuerster, Ralf-Rainer Rohloff

Proc. SPIE. 7734, Optical and Infrared Interferometry II

KEYWORDS: Actuators, Telescopes, Mirrors, Digital signal processing, Sensors, Digital filtering, Interferometry, Vibrometry, Optical benches, Mirror mounts

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Proceedings Article | 22 July 2010 Paper

A very wide-field wavefront sensor for a very narrow-field interferometer

V. Viotto, R. Ragazzoni, C. Arcidiacono, M. Bergomi, A. Brunelli, M. Dima, J. Farinato, G. Gentile, D. Magrin, G. Cosentino, E. Diolaiti, I. Foppiani, M. Lombini, L. Schreiber, T. Bertram, P. Bizenberger, F. De Bonis, W. Gässler, T. Herbst, M. Kuerster, D. Meschke, L. Mohr, R.-R. Rohloff

Proc. SPIE. 7734, Optical and Infrared Interferometry II

KEYWORDS: Observatories, Point spread functions, Telescopes, Mirrors, Stars, Sensors, Interferometry, Wavefront sensors, Adaptive optics, Selenium

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Proceedings Article | 22 July 2010 Paper

Feeding the wavefront sensors of LINC-NIRVANA: the dedicated Patrol Camera

Dario Lorenzetti, Francesco D'Alessio, Gianluca Li Causi, Fabrizio Vitali, Mauro Centrone, Roberto Speziali, Emiliano Diolaiti, Jacopo Farinato, Roberto Ragazzoni, Thomas Bertram, Florian Briegel, Fulvio De Bonis, Wolfgang Gässler, Tom Herbst, Martin Kürster, Ralf-Rainer Rohloff

Proc. SPIE. 7734, Optical and Infrared Interferometry II

KEYWORDS: Signal to noise ratio, Mirrors, Stars, Cameras, Interfaces, Distortion, CCD cameras, Frequency modulation, Fermium, Charge-coupled devices

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Proceedings Article | 21 July 2010 Paper

eXtreme multiplex spectrograph: a high-demanding mechanical design

S. Becerril, K. Meisenheimer, C. Dubbeldam, R. Content, R. Rohloff, F. Prada, T. Shanks, R. Sharples

Proc. SPIE. 7735, Ground-based and Airborne Instrumentation for Astronomy III

KEYWORDS: Optomechanical design, Spectrographs, Stars, Cameras, Sensors, Interfaces, Aluminum, Mechanical engineering, Tolerancing, Camera shutters

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Proceedings Article | 20 July 2010 Paper

Prototyping and testing of mechanical components for the GRAVITY spectrometers

Michael Wiest, Sebastian Fischer, Markus Thiel, Marcus Haug, Ralf-Rainer Rohloff, Christian Straubmeier, Constanza Araujo-Hauck, Senol Yazici, Frank Eisenhauer, Guy Perrin, Wolfgang Brandner, Karine Perraut, Antonio Amorim, Markus Schöller, Andreas Eckart

Proc. SPIE. 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation

KEYWORDS: Actuators, Optical components, Sensors, Spectrometers, Manufacturing, Polarimetry, Spectral resolution, Computer aided design, Cryogenics, Prototyping

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Proceedings Article | 20 July 2010 Paper

Characterization and performance of the 4k x 4k Hawaii-2RG Mosaic for PANIC

Vianak Naranjo, Ulrich Mall, José Ricardo Ramos, Clemens Storz, Karl Wagner, Matthias Alter, Harald Baumeister, Peter Bizenberger, M. C. Cárdenas, Matilde Fernández, Josef Fried, Antonio García Segura, Jens Helmling, Armin Huber, J. Ibáñez Mengual, Werner Laun, Rainer Lenzen, Julio Rodríguez Gómez, Ralf-Rainer Rohloff

Proc. SPIE. 7742, High Energy, Optical, and Infrared Detectors for Astronomy IV

KEYWORDS: Infrared detectors, Infrared sensors, Observatories, Electronics, Cameras, Sensors, Denoising, Interference (communication), Field programmable gate arrays, Panoramic photography

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Proceedings Article | 20 July 2010 Paper

A novel athermal approach for high-performance cryogenic metal optics

Ralf-Rainer Rohloff, Andreas Gebhardt, Veit Schönherr, Stefan Risse, Jan Kinast, Sebastian Scheiding, Thomas Peschel

Proc. SPIE. 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation

KEYWORDS: Telescopes, Mirrors, Diamond, Polishing, Nickel, Silicon, Interferometry, Aluminum, Cryogenics, Temperature metrology

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Proceedings Article | 20 July 2010 Paper

Opto-mechanical design of PANIC

Josef Fried, Harald Baumeister, Armin Huber, Werner Laun, Ralf-Rainer Rohloff, M. Concepción Cárdenas

Proc. SPIE. 7735, Ground-based and Airborne Instrumentation for Astronomy III

KEYWORDS: Optomechanical design, Telescopes, Optical filters, Mirrors, Optical design, Electronics, Lenses, Sensors, Space telescopes, Tolerancing

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Proceedings Article | 20 July 2010 Paper

High-precision cryogenic wheel mechanisms of the JWST/MIRI instrument: performance of the flight models

O. Krause, F. Müller, S. Birkmann, A. Böhm, M. Ebert, U. Grözinger, Th. Henning, R. Hofferbert, A. Huber, D. Lemke, R.-R. Rohloff, S. Scheithauer, T. Gross, T. Fischer, G. Luichtel, H. Merkle, M. Übele, H.-U. Wieland, J. Amiaux, R. Jager, A. Glauser, P. Parr-Burman, J. Sykes

Proc. SPIE. 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation

KEYWORDS: Optical filters, Sensors, Interfaces, Magnetism, Kinematics, Position sensors, Performance modeling, James Webb Space Telescope, Cryogenics, Instrument modeling

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Proceedings Article | 15 July 2010 Paper

METIS opto-mechanical design and packaging study

Gabby Kroes, Rik ter Horst, Jan Kragt, Ronald Roelfsema, Ramón Navarro, Lars Venema, Rainer Lenzen, Ralf Rohloff, Gilles Durand, Eric Pantin, Samuel Ronayette, Stephen Todd, Richard Bennett, Alistair Glasse, Joris Blommaert, Bernhard Brandl, Maurice Teuwen, Huub Janssen, Robert Huisman

Proc. SPIE. 7735, Ground-based and Airborne Instrumentation for Astronomy III

KEYWORDS: Packaging, Mirrors, Electronics, Imaging systems, Calibration, Spectroscopy, Interfaces, Wavefront sensors, Imaging spectroscopy, Cryogenics

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Proceedings Article | 15 July 2010 Paper

XMS and NG1dF: extreme multiplex spectrographs for wide-field multi-object spectroscopy

Robert Content, Sam Barden, Santiago Becerril, Armin Boehm, Paul Clark, Pedro Costillo, C. Mark Dubbeldam, Tony Farrell, Karl Glazebrook, Roger Haynes, Klaus Meisenheimer, Stan Miziarski, Nikolaos Nikoloudakis, Luis Francisco Prada, Ralf-Rainer Rohloff, Tom Shanks, Ray Sharples, Karl Wagner

Proc. SPIE. 7735, Ground-based and Airborne Instrumentation for Astronomy III

KEYWORDS: Telescopes, Spectrographs, Lenses, Sensors, Spectroscopy, Image quality, Spectral resolution, Mechanical engineering, Galactic astronomy, Baryon acoustic oscillations

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Proceedings Article | 15 July 2010 Paper

CARMENES: Calar Alto high-resolution search for M dwarfs with exo-earths with a near-infrared Echelle spectrograph

A. Quirrenbach, P. Amado, H. Mandel, J. Caballero, R. Mundt, I. Ribas, A. Reiners, M. Abril, J. Aceituno, C. Afonso, D. Barrado y Navascues, J. Bean, V. J. Béjar, S. Becerril, A. Böhm, M. Cárdenas, A. Claret, J. Colomé, L. Costillo, S. Dreizler, M. Fernández, X. Francisco, D. Galadí, R. Garrido, J. González Hernández, J. Guàrdia, E. Guenther, F. Gutiérrez-Soto, V. Joergens, A. Hatzes, J. Helmling, T. Henning, E. Herrero, M. Kürster, W. Laun, R. Lenzen, U. Mall, E. Martin, S. Martín-Ruiz, E. Mirabet, D. Montes, J. Morales, R. Morales Muñoz, A. Moya, V. Naranjo, O. Rabaza, A. Ramón, R. Rebolo, S. Reffert, F. Rodler, E. Rodríguez, A. Rodríguez Trinidad, R. Rohloff, M. Sánchez Carrasco, C. Schmidt, W. Seifert, J. Setiawan, E. Solano, O. Stahl, C. Storz, J. Suárez, U. Thiele, K. Wagner, G. Wiedemann, M. Zapatero Osorio, C. del Burgo, E. Sánchez-Blanco, W. Xu

Proc. SPIE. 7735, Ground-based and Airborne Instrumentation for Astronomy III

KEYWORDS: Optical fibers, Telescopes, Spectrographs, Stars, Sensors, Calibration, Lamps, Exoplanets, Spectral resolution, Planets

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Proceedings Article | 28 July 2008

GRAVITY: getting to the event horizon of Sgr A*

F. Eisenhauer, G. Perrin, W. Brandner, C. Straubmeier, A. Richichi, S. Gillessen, J. P. Berger, S. Hippler, A. Eckart, M. Schöller, S. Rabien, F. Cassaing, R. Lenzen, M. Thiel, Y. Clénet, J. R. Ramos, S. Kellner, P. Fédou, H. Baumeister, R. Hofmann, E. Gendron, A. Boehm, H. Bartko, X. Haubois, R. Klein, K. Dodds-Eden, K. Houairi, F. Hormuth, A. Gräter, L. Jocou, V. Naranjo, R. Genzel, P. Kervella, T. Henning, N. Hamaus, S. Lacour, U. Neumann, M. Haug, F. Malbet, W. Laun, J. Kolmeder, T. Paumard, R.-R. Rohloff, O. Pfuhl, K. Perraut, J. Ziegleder, D. Rouan, G. Rousset

Proc. SPIE. 7013, Optical and Infrared Interferometry

KEYWORDS: Near infrared, Telescopes, Metrology, Stars, Sensors, Spectroscopy, Interferometry, Wavefront sensors, Adaptive optics, Integrated optics

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Proceedings Article | 25 July 2008 Paper

Cryogenic wheel mechanisms for the Mid-Infrared Instrument (MIRI) of the James Webb Space Telescope (JWST): detailed design and test results from the qualification program

O. Krause, S. Birkmann, T. Blümchen, A. Böhm, M. Ebert, U. Grözinger, Th. Henning, R. Hofferbert, A. Huber, D. Lemke, R.-R. Rohloff, S. Scheithauer, T. Gross, G. Luichtel, C. Stein, R. Stott, M. Übele, J. Amiaux, J.-L. Auguères, A. Glauser, A. Zehnder, M. Meijers, R. Jager, P. Parr-Burrman, G. Wright

Proc. SPIE. 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation

KEYWORDS: Mid-IR, Optical filters, Sensors, Spectroscopy, Interfaces, Magnetism, Kinematics, Position sensors, James Webb Space Telescope, Cryogenics

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Proceedings Article | 23 July 2008 Paper

A cryogenic dithering stage for moving SPHERE-IRDIS' detector

Ralf-Rainer Rohloff, Thomas Blümchen, Markus Feldt, Vianak Naranjo, Jose Ramos, Klaus-Dieter Müller, Harry Marth, Patrick Pertsch, Kjetil Dohlen

Proc. SPIE. 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation

KEYWORDS: Actuators, Optical spheres, Sensors, Calibration, Ceramics, Dielectrics, Exoplanets, Optical benches, Planets, Cryogenics

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Proceedings Article | 17 July 2008 Paper

An infrared test camera for LBT adaptive optics commissioning

Italo Foppiani, Matteo Lombini, Giovanni Bregoli, Giuseppe Cosentino, Emiliano Diolaiti, Giancarlo Innocenti, Daniel Meschke, Ralf-Rainer Rohloff, Thomas Herbst, Costantino Ciattaglia

Proc. SPIE. 7015, Adaptive Optics Systems

KEYWORDS: Infrared cameras, Point spread functions, Telescopes, Optical filters, Lenses, Cameras, Sensors, Adaptive optics, Infrared radiation, Technetium

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Proceedings Article | 15 July 2008 Paper

Near-infrared wavefront sensing for the VLT interferometer

Stefan Hippler, Wolfgang Brandner, Yann Clénet, Felix Hormuth, Eric Gendron, Thomas Henning, Ralf Klein, Rainer Lenzen, Daniel Meschke, Vianak Naranjo, Udo Neumann, José Ricardo Ramos, Ralf-Rainer Rohloff, Frank Eisenhauer

Proc. SPIE. 7015, Adaptive Optics Systems

KEYWORDS: Telescopes, Electronics, Stars, Interferometers, Sensors, Wavefront sensors, Wavefronts, Adaptive optics, Control systems, Deformable mirrors

Read Abstract +

Proceedings Article | 15 July 2008 Paper

The Multiple Field of View Layer Oriented wavefront sensing system of LINC-NIRVANA: two arcminutes of corrected field using solely Natural Guide Stars

J. Farinato, R. Ragazzoni, C. Arcidiacono, A. Brunelli, M. Dima, G. Gentile, V. Viotto, E. Diolaiti, I. Foppiani, M. Lombini, L. Schreiber, P. Bizenberger, F. De Bonis, S. Egner, W. Gässler, T. Herbst, M. Kürster, L. Mohr, R.-R. Rohloff

Proc. SPIE. 7015, Adaptive Optics Systems

KEYWORDS: Observatories, Telescopes, Mirrors, Stars, Lenses, Sensors, Wavefront sensors, Deformable mirrors, Sensing systems, Optical benches

Read Abstract +

Proceedings Article | 15 July 2008 Paper

Integration of the mid-high wavefront sensor to the Linc-Nirvana post-focal relay

Laura Schreiber, Matteo Lombini, Italo Foppiani, Daniel Meschke, Fulvio De Bonis, Peter Bizenberger, Giovanni Bregoli, Giuseppe Cosentino, Emiliano Diolaiti, Sebastian Egner, Jacopo Farinato, Wolfgang Gaessler, Tom Herbst, Giancarlo Innocenti, Frank Kittmann, Lars Mohr, Roberto Ragazzoni, Ralf-Rainer Rohloff

Proc. SPIE. 7015, Adaptive Optics Systems

KEYWORDS: Telescopes, Mirrors, Stars, Sensors, Wavefront sensors, Deformable mirrors, Collimators, Relays, Charge-coupled devices, Device simulation

Read Abstract +

Proceedings Article | 10 July 2008 Paper

Vibration measurements at the Large Binocular Telescope (LBT)

M. Brix, V. Naranjo, U. Beckmann, R. Bertram, T. Bertram, J. Brynnel, S. Egner, W. Gaessler, T. Herbst, M. Kuerster, R. Rohloff, S. Rost, J. Schmidt

Proc. SPIE. 7012, Ground-based and Airborne Telescopes II

KEYWORDS: Actuators, Optical components, Telescopes, Mirrors, Sensors, Control systems, Computer programming, Electroluminescence, Vibrometry, Signal processing

Read Abstract +

Proceedings Article | 9 July 2008 Paper

PANIC: the new panoramic NIR camera for Calar Alto

Harald Baumeister, Matthias Alter, M. Concepción Cárdenas Vázquez, Matilde Fernandez, Josef Fried, Jens Helmling, Armin Huber, Jose-Miguel Ibáñez Mengual, Julio F. Rodríguez Gómez, Werner Laun, Rainer Lenzen, Ulrich Mall, Vianak Naranjo, Jose-Ricardo Ramos, Ralf-Rainer Rohloff, Antonio García Segura, Clemens Storz, Marcos Ubierna, Karl Wagner

Proc. SPIE. 7014, Ground-based and Airborne Instrumentation for Astronomy II

KEYWORDS: Near infrared, Telescopes, Optical filters, Mirrors, Silica, Lenses, Cameras, Sensors, Nitrogen, Cryogenics

Read Abstract +

Proceedings Article | 11 July 2006 Paper

LUCIFER status report: Summer 2006

H. Mandel, I. Appenzeller, W. Seifert, H. Baumeister, R.-J. Dettmar, C. Feiz, H. Gemperlein, A. Germeroth, B. Grimm, J. Heidt, T. Herbst, R. Hofmann, M. Jütte, V. Knierim, W. Laun, T. Luks, M. Lehmitz, R. Lenzen, K. Polsterer, A. Quirrenbach, R.-R. Rohloff, J. Rosenberger, P. Weiser, H. Weisz

Proc. SPIE. 6269, Ground-based and Airborne Instrumentation for Astronomy

KEYWORDS: Telescopes, Spectrographs, Electronics, Optomechanical components, Cameras, Interfaces, Manufacturing, Control systems, Java, Molybdenum

Read Abstract +

Proceedings Article | 10 July 2006 Paper

Cryogenic filter- and spectrometer wheels for the Mid Infrared Instrument (MIRI) of the James Webb Space Telescope (JWST)

D. Lemke, A. Böhm, F. de Bonis, M. Ebert, T. Gross, U. Grözinger, T. Henning, M. Hinz, R. Hofferbert, A. Huber, O. Krause, S. Kuhlmann, G. Luichtel, J. Ramos, R.-R. Rohloff, C. Stein, M. Trunz, M. Übele, K. Weidlich

Proc. SPIE. 6273, Optomechanical Technologies for Astronomy

KEYWORDS: Mid-IR, Optical components, Optical filters, Imaging systems, Spectroscopy, Interfaces, Kinematics, Infrared spectroscopy, James Webb Space Telescope, Cryogenics

Read Abstract +

Proceedings Article | 6 July 2006 Paper

CFRP structure for the LBT instrument LINC-NIRVANA

Ralf-Rainer Rohloff, Norbert Münch, Armin Böhm, Wolfram Schlossmacher, Carsten Schöppinger, Hartmut Neugeboren, Henrik Wittke, Henning Wichmann

Proc. SPIE. 6273, Optomechanical Technologies for Astronomy

KEYWORDS: Carbon, Telescopes, Mirrors, Manufacturing, Interferometry, Finite element methods, Aluminum, Optical benches, Optics manufacturing, Device simulation

Read Abstract +

Proceedings Article | 28 June 2006 Paper

The MCAO wavefront sensing system of LINC-NIRVANA: status report

Jacopo Farinato, Roberto Ragazzoni, Carmelo Arcidiacono, Gentile Giorgia, Emiliano Diolaiti, Italo Foppiani, Matteo Lombini, Laura Schreiber, Dario Lorenzetti, Francesco D'Alessio, Gianluca Li Causi, Fernando Pedichini, Fabrizio Vitali, Tom Herbst, Martin Kürster, Peter Bizenberger, Florian Briegel, Fulvio De Bonis, Sebastian Egner, Wolfgang Gässler, Lars Mohr, Alexei Pavlov, Ralf Rainer Rohloff, Roberto Soci

Proc. SPIE. 6272, Advances in Adaptive Optics II

KEYWORDS: Observatories, Telescopes, Mirrors, Stars, Imaging systems, Cameras, Sensors, Wavefront sensors, Deformable mirrors, Sensing systems

Read Abstract +

Proceedings Article | 29 August 2005 Paper

Lessons learnt and implemented: from ISO- to HERSCHEL- and JWST-instrumentation

D. Lemke, U. Groezinger, R. Hofferbert, U. Klaas, A. Boehm, R.-R. Rohloff

Proc. SPIE. 5883, Infrared Spaceborne Remote Sensing 2005

KEYWORDS: Infrared sensors, Telescopes, Optical filters, Sensors, Calibration, Spectroscopy, Space telescopes, Infrared radiation, James Webb Space Telescope, Picture Archiving and Communication System

Read Abstract +

Proceedings Article | 25 October 2004 Paper

LINC-NIRVANA: the single arm MCAO experiment

Sebastian Egner, Wolfgang Gaessler, Tom Herbst, Roberto Ragazzoni, Remko Stuik, D. Andersen, C. Arcidiacono, H. Baumeister, U. Beckmann, J. Behrend, T. Bertram, P. Bizenberger, H. Boehnhardt, E. Diolaiti, T. Driebe, A. Eckhardt, J. Farinato, M. Kuerster, W. Laun, S. Ligori, Vianak Naranjo, E. Nußbaum, H.-W. Rix, R.-R. Rohloff, Piero Salinari, R. Soci, C. Straubmeier, E. Vernet-Viard, Gerd Weigelt, R. Weiss, W. Xu

Proc. SPIE. 5490, Advancements in Adaptive Optics

KEYWORDS: Actuators, Telescopes, Mirrors, Stars, Interferometers, Cameras, Wavefront sensors, Adaptive optics, Deformable mirrors, Temperature metrology

Read Abstract +

Proceedings Article | 25 October 2004 Paper

LINC-NIRVANA: mechanical challanges of the MCAO wavefront sensor

Roberto Soci, Roberto Ragazzoni, Thomas Herbst, Jacopo Farinato, Wolfgang Gaessler, Harald Baumeister, Ralf-Rainer Rohloff, Emiliano Diolaiti, Wenli Xu, David Andersen, Sebastian Egner, Carmelo Arcidiacono, Matteo Lombini, Monica Ebert, Armin Boehm, Norbert Muench, Marco Xompero

Proc. SPIE. 5490, Advancements in Adaptive Optics

KEYWORDS: Optical components, Telescopes, Mirrors, Stars, Cameras, Sensors, Wavefront sensors, Adaptive optics, Finite element methods, Selenium

Read Abstract +

Proceedings Article | 25 October 2004 Paper

LINC-NIRVANA: how to get a 23-m wavefront nearly flat

Wolfgang Gaessler, Roberto Ragazzoni, Thomas Herbst, David Andersen, Carmelo Arcidiacono, Harald Baumeister, Udo Beckmann, Jan Behrend, Thomas Bertram, Peter Bizenberger, Hermann Bohnhardt, F. Briegel, Emiliano Diolaiti, Thomas Driebe, A. Eckhardt, Sebastian Egner, Jacopo Farinato, Matthias Heininger, M. Kürster, Werner Laun, Sebastiano Ligori, Vianak Naranjo, Edmund Nussbaum, Hans-Walter Rix, Ralf-Rainer Rohloff, Piero Salinari, Roberto Soci, Clemens Storz, Christian Straubmeier, Elise Vernet-Viard, Gerd Weigelt, Robert Weiss, Wenli Xu

Proc. SPIE. 5490, Advancements in Adaptive Optics

KEYWORDS: Actuators, Telescopes, Mirrors, Stars, Sensors, Interferometry, Wavefront sensors, Wavefronts, Adaptive optics, Turbulence

Read Abstract +

Proceedings Article | 20 October 2004 Paper

Recombining light of the VLTI at 10 microns by densifying the images

Michel Dugue, Bruno Lopez, Frank Przygodda, Uwe Graser, Philippe Gitton, Sebastian Wolf, Philippe Mathias, Pierre Antonelli, J. C. Augereau, Nicole Berruyer, Yves Bresson, Olivier Chesneau, Anne Dutrey, Sebastien Flament, Annelie Glazenborg-Kluttig, Andreas Glindemann, Thomas Henning, Karl-Heinz Hofmann, Stephane Lagarde, Yves Hugues, Christoph Leinert, Klaus Meisenheimer, Jean-Luc Menut, Ralf-Rainer Rohloff, Alain Roussel, Eric Thiebaut, Gerd Weigelt

Proc. SPIE. 5491, New Frontiers in Stellar Interferometry

KEYWORDS: Mid-IR, Observatories, Telescopes, Mirrors, Segmented mirrors, Stars, Interferometry, Synthetic apertures, Optical instrument design, Astatine

Read Abstract +

Proceedings Article | 20 October 2004 Paper

APreS-MIDI, APerture Synthesis in the MID-infrared with the VLTI

Bruno Lopez, Frank Przygodda, Sebastian Wolf, Michel Dugue, Uwe Graser, Philippe Gitton, Philippe Mathias, Pierre Antonelli, J. C. Augereau, Nicole Berruyer, Yves Bresson, Olivier Chesneau, Anne Dutrey, Sebastien Flament, Annelie Glazenborg, Andreas Glindemann, Thomas Henning, Karl-Heinz Hofmann, Yves Hugues, Stephane Lagarde, Christoph Leinert, Klaus Meisenheimer, Jean-Luc Menut, Ralf-Rainer Rohloff, Alain Roussel, Eric Thiebaut, Gerd Weigelt

Proc. SPIE. 5491, New Frontiers in Stellar Interferometry

KEYWORDS: Mid-IR, Telescopes, Stars, Interferometers, Interferometry, Space telescopes, Synthetic apertures, Galactic astronomy, Astatine, Visibility

Read Abstract +

Proceedings Article | 30 September 2004 Paper

LUCIFER status report, summer 2004

Holger Mandel, Immo Appenzeller, Walter Seifert, Harald Baumeister, Peter Bizenberger, Ralf-Juergen Dettmar, Hans Gemperlein, Bernhard Grimm, Tom Herbst, Reiner Hofmann, Marcus Jutte, Werner Laun, Michael Lehmitz, Sebastiano Ligori, Rainer Lenzen, Kai Polsterer, Ralf-Rainer Rohloff, Andreas Schuetze, Andreas Seltmann, Peter Weiser, Harald Weisz, Wenli Xu

Proc. SPIE. 5492, Ground-based Instrumentation for Astronomy

KEYWORDS: Near infrared, Optical filters, Mirrors, Spectrographs, Cameras, Sensors, Manufacturing, Control systems, Java, Molybdenum

Read Abstract +

Proceedings Article | 29 September 2004 Paper

Cryogenic actuators in ground-based astronomical instrumentation

Ralf-Rainer Rohloff, Harald Baumeister, Monica Ebert, Norbert Munch, Vianak Naranjo

Proc. SPIE. 5495, Astronomical Structures and Mechanisms Technology

KEYWORDS: Actuators, Astronomy, Spindles, Titanium, Switches, Sensors, Tungsten, Aluminum, Astronomical instrumentation, Cryogenics

Read Abstract +

Proceedings Article | 29 September 2004 Paper

Prototyping of cryomechanisms for the JWST near-infrared spectrograph (NIRSpec)

Ralph Hofferbert, Dietrich Lemke, Armin Bohm, Ulrich Grozinger, Thomas Henning, Armin Huber, Oliver Krause, Stefan Mertin, Jose Ramos, Ralf-Rainer Rohloff, Georg Luichtel, Kai Weidlich, Gilles Baudin, Winfried Posselt, Ruben Nalbandian, Peter Jensen

Proc. SPIE. 5495, Astronomical Structures and Mechanisms Technology

KEYWORDS: Actuators, Optical filters, Mirrors, Spectrographs, Sensors, Linear filtering, Space telescopes, Astronomical imaging, James Webb Space Telescope, Prototyping

Read Abstract +

Proceedings Article | 29 September 2004 Paper

Positioning of optical elements in the cryogenically cooled mid-infrared instrument MIRI for the James Webb Space Telescope

Dietrich Lemke, Ralph Hofferbert, Ulrich Grozinger, Ralf-Rainer Rohloff, Armin Bohm, Thomas Henning, Armin Huber, Stefan Mertin, Jose Ramos, Gillian Wright, Peter Hastings, Alex Zehnder, Sophie Salasca, Gabby Kroes, Christian Straubmeier, Andreas Eckart

Proc. SPIE. 5495, Astronomical Structures and Mechanisms Technology

KEYWORDS: Mid-IR, Optical components, Optical filters, Mirrors, Electronics, Imaging systems, Sensors, Spectroscopy, James Webb Space Telescope, Picture Archiving and Communication System

Read Abstract +

Proceedings Article | 7 July 2004 Paper

Layer-Oriented on paper, laboratory, and soon on the sky

Jacopo Farinato, Roberto Ragazzoni, Carmelo Arcidiacono, Bagnara Paolo, Andrea Baruffolo, Harald Baumeister, Raffaella Bisson, Hermann Bohnhardt, Angela Brindisi, Joar Brynnel, Massimo Cecconi, Julien Coyne, Bernhard Delabre, Emiliano Diolaiti, Rob Donaldson, Enrico Fedrigo, Francis Franza, Wolfgang Gassler, Adriano Ghedina, Thomas Herbst, Norbert Hubin, Stephan Kellner, Johann Kolb, Jean-Louis Lizon, Matteo Lombini, Enrico Marchetti, Gianluigi Meneghini, Lars Mohr, Roland Reiss, Ralf-Rainer Rohloff, Roberto Soci, Elise Vernet, Robert Weiss, Marco Xompero, Wenli Xu

Proc. SPIE. 5382, Second Backaskog Workshop on Extremely Large Telescopes

KEYWORDS: Telescopes, Mirrors, Stars, Sensors, Interferometry, Wavefront sensors, Wavefronts, Adaptive optics, Deformable mirrors, Prototyping

Read Abstract +

Proceedings Article | 7 July 2004 Paper

LINC-NIRVANA: first attempt of an instrument for a 23-m-class telescope

Wolfgang Gassler, Thomas Herbst, Roberto Ragazzoni, David Andersen, Carmelo Arcidiacono, Harald Baumeister, Udo Beckmann, Thomas Bertram, Peter Bizenberger, Hermann Bohnhardt, Emiliano Diolaiti, Andreas Eckart, Jacopo Farinato, Sebastiano Ligori, Hans-Walter Rix, Ralf-Rainer Rohloff, Piero Salinari, Roberto Soci, Christian Straubmeier, Elise Vernet-Viard, Gerd Weigelt, Robert Weiss, Wenli Xu

Proc. SPIE. 5382, Second Backaskog Workshop on Extremely Large Telescopes

KEYWORDS: Telescopes, Mirrors, Stars, Cameras, Sensors, Wavefront sensors, Adaptive optics, Deformable mirrors, Collimators, Optical instrument design

Read Abstract +

Proceedings Article | 24 December 2003 Paper

Layer-oriented MCAO projects and experiments: an update

Roberto Ragazzoni, Roberto Soci, Carmelo Arcidiacono, Andrea Baruffolo, Harald Baumeister, Raffaella Bisson, Hermann Bohnhardt, Angela Brindisi, Julien Coyne, Emiliano Diolaiti, Jacopo Farinato, Wolfgang Gassler, Tom Herbst, Matteo Lombini, Gianluigi Meneghini, Lars Mohr, Ralf-Rainer Rohloff, Elise Vernet-Viard, Robert Weiss, Marco Xompero, Wenli Xu

Proc. SPIE. 5169, Astronomical Adaptive Optics Systems and Applications

KEYWORDS: Telescopes, Astronomy, Stars, Interferometers, Sensors, Interferometry, Wavefront sensors, Adaptive optics, Astronomical telescopes, Prototyping

Read Abstract +

Proceedings Article | 10 November 2003 Paper

Cryomechanisms for the instruments MIRI and NIRSpec on the James Webb Space Telescope (JWST)

Ralph Hofferbert, Dietrich Lemke, Ulrich Groezinger, Thomas Henning, Stefan Mertin, Ralf-Rainer Rohloff, Karl Wagner, Gillian Wright, Huib Visser, Josef Katzer, M. Salvasohn, Winfried Posselt, Guy Fargant, Ruben Nalbandian

Proc. SPIE. 5152, Infrared Spaceborne Remote Sensing XI

KEYWORDS: Actuators, Optical components, Optical filters, Mirrors, Spectrographs, Prisms, Electronics, Calibration, James Webb Space Telescope, Picture Archiving and Communication System

Read Abstract +

Proceedings Article | 7 March 2003 Paper

LUCIFER: a multimode NIR instrument for the LBT

Walter Seifert, Immo Appenzeller, Harald Baumeister, Peter Bizenberger, Dominik Bomans, Ralf-Juergen Dettmar, Bernard Grimm, Tom Herbst, Reiner Hofmann, Marcus Juette, Werner Laun, Michael Lehmitz, Roland Lemke, Rainer Lenzen, Holger Mandel, K. Polsterer, Ralf-Rainer Rohloff, A. Schuetze, Andreas Seltmann, Niranjan Thatte, Peter Weiser, Wenli Xu

Proc. SPIE. 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes

KEYWORDS: Near infrared, Telescopes, Mirrors, Electronics, Cameras, Sensors, Imaging spectroscopy, Control systems, Molybdenum, Spectroscopes

Read Abstract +

Proceedings Article | 7 March 2003 Paper

Cryogenic engineering for OMEGA2000: design and performance

Harald Baumeister, Peter Bizenberger, Coryn Bayler-Jones, Zoltan Kovacs, Hermann-Josef Roeser, Ralf-Rainer Rohloff

Proc. SPIE. 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes

KEYWORDS: Near infrared, Telescopes, Optical filters, Mirrors, Silica, Cameras, Sensors, Nitrogen, Tolerancing, Cryogenics

Read Abstract +

Proceedings Article | 5 March 2003 Paper

Cryomechanisms for positioning the optical components of the mid-infrared instrument (MIRI) for NGST

Dietrich Lemke, Ulrich Groezinger, Thomas Henning, Ralph Hofferbert, Ralf-Rainer Rohloff, Karl Wagner, Laurent Martin, Gabby Kroes, Gillian Wright

Proc. SPIE. 4850, IR Space Telescopes and Instruments

KEYWORDS: Optical components, Optical filters, Mirrors, Electronics, Imaging systems, Sensors, Calibration, Space telescopes, Infrared telescopes, Prototyping

Read Abstract +

Proceedings Article | 21 February 2003 Paper

LINC-NIRVANA: a Fizeau beam combiner for the Large Binocular Telescope

Tom Herbst, Roberto Ragazzoni, David Andersen, H. Boehnhardt, Peter Bizenberger, Andreas Eckart, W. Gaessler, Hans-Walter Rix, Ralf-Rainer Rohloff, Piero Salinari, R. Soci, Christian Straubmeier, W. Xu

Proc. SPIE. 4838, Interferometry for Optical Astronomy II

KEYWORDS: Point spread functions, Telescopes, Mirrors, Optical design, Sensors, Interferometry, Wavefront sensors, Adaptive optics, Space telescopes, Spatial resolution

Read Abstract +

Proceedings Article | 7 February 2003 Paper

Design of the atmospheric sodium profiler for the VLT laser guide star

David Butler, Stefan Hippler, Udo Neumann, Ralf-Rainer Rohloff, Bernard Grimm, Richard Davies

Proc. SPIE. 4839, Adaptive Optical System Technologies II

KEYWORDS: Avalanche photodetectors, Modulation, LIDAR, Photons, Data transmission, Modulators, Sodium, Laser guide stars, Bragg cells, Pulsed laser operation

Read Abstract +

Proceedings Article | 7 February 2003 Paper

Visible MCAO channel for NIRVANA at the LBT

Roberto Ragazzoni, Tom Herbst, Wolfgang Gaessler, David Andersen, Carmelo Arcidiacono, Andrea Baruffolo, Harald Baumeister, Peter Bizenberger, Emiliano Diolaiti, Simone Esposito, Jacopo Farinato, Hans Rix, Ralf-Rainer Rohloff, Armando Riccardi, Piero Salinari, Roberto Soci, Elise Vernet-Viard, Wenli Xu

Proc. SPIE. 4839, Adaptive Optical System Technologies II

KEYWORDS: Telescopes, Mirrors, Stars, Cameras, Sensors, Interferometry, Wavefront sensors, Deformable mirrors, Atmospheric corrections, Space telescopes

Read Abstract +

Proceedings Article | 16 November 2000 Paper

Cold focal plane chopper for the PACS instrument of the FIRST satellite: tests of an advanced prototype

Oliver Krause, Dietrich Lemke, Ulrich Groezinger, Armin Boehm, Harald Baumeister, Ralf-Rainer Rohloff

Proc. SPIE. 4131, Infrared Spaceborne Remote Sensing VIII

KEYWORDS: Actuators, Mirrors, Modulation, Satellites, Magnetism, Aluminum, Position sensors, Cryogenics, Prototyping, Picture Archiving and Communication System

Read Abstract +

Proceedings Article | 7 July 2000 Paper

Sodium layer monitoring at Calar Alto by LIDAR

David Butler, Richard Davies, Hayden Fews, R. Michael Redfern, Nancy Ageorges, Wolfgang Hackenberg, Ralf-Rainer Rohloff, Sebastian Rabien, Thomas Ott, Stefan Hippler

Proc. SPIE. 4007, Adaptive Optical Systems Technology

KEYWORDS: Telescopes, Avalanche photodetectors, LIDAR, Sensors, Calibration, Photons, Adaptive optics, Sodium, Laser guide stars, Pulsed laser operation

Read Abstract +

Observations have shown the presence of sodium layer centroid height variations of a few hundred meters on timescales of tens of seconds. As quality laser guide star (LGS) plus adaptive optics (AO) assisted astronomy, especially on large (8m+) telescopes, will require optimal scheduling of observations and regular laser and wavefront sensor focusing at sites where sporadic sodium layers are frequent, an 'easy to use' sodium layer monitor is required. LIDAR offers a convenient means to achieve this. By pulsing the outgoing sodium laser and performing time-of-flight measurements on the returned photons we can acquire the altitude profile of the sodium layer. Unfortunately, conventional LIDAR requires the laser duty cycle to be very low, therefore large integration times are required. However, by using a cross-correlation technique the duty cycle can be increased to 50%, which gives far better performance. We present the details of this technique which involved amplitude modulation of the MPIA/MPE ALFA cw laser, as well as the following results of such LIDAR measurements performed in October 1999 at the 3.5 m telescope at Calar Alto Observatory in Spain. The altitude of the sodium layer at Calar Alto on 17th and 18th October 1999 was found to be at 90 +/- 3 km and there is evidence for sporadics on one of two nights with sporadic layer FWHM* varying from approximately 240 to 350 m. In addition, a noticeable layer FWHM change (excluding the sporadic layer) from approximately 13 to approximately 5 - 7 km was observed over the two nights. After flux and altitude calibration and correction of the projected altitude range, a very good agreement is found between sodium layer profiles derived from an auxiliary telescope and 3.5 m telescope LIDAR observations. Using an intensity weighted centroid algorithm the centroid height of the sodium layer was observed to have a variation of < 500 m in approximately 10 minutes. Although, shorter timescale variations may be have been present, poor observing conditions and resulting reduced S/N prevents this analysis.

Proceedings Article | 5 July 2000 Paper

Cryo design for the VLTI MIDI instrument

Ralf-Rainer Rohloff, Werner Laun, Uwe Graser, Norbert Ortlieb, Matthias Lebong

Proc. SPIE. 4006, Interferometry in Optical Astronomy

KEYWORDS: Thermography, Switches, Mechanics, Sensors, Copper, Nitrogen, Interferometry, Aluminum, Liquids, Current controlled current source

Read Abstract +

Proceedings Article | 6 December 1999 Paper

Focal plane chopper for the PACS instrument aboard the far-infrared space telescope FIRST

Dietrich Lemke, Ulrich Groezinger, Oliver Krause, Ralf-Rainer Rohloff, Ruediger Haberland

Proc. SPIE. 3759, Infrared Spaceborne Remote Sensing VII

KEYWORDS: Actuators, Mirrors, Copper, Manufacturing, Resistance, Magnetism, Space telescopes, Cryogenics, Prototyping, Picture Archiving and Communication System

Read Abstract +

Proceedings Article | 29 October 1999 Paper

Lightweighted secondary mirror for the United Kingdom Infrared Telescope

Ralf-Rainer Rohloff, Eckhart Pitz, Timothy Hawarden, Nicholas Rees, Eli Ettedgui-Atad, Horst Kaufmann, Lutz Schmadel

Proc. SPIE. 3785, Advanced Telescope Design, Fabrication, and Control

KEYWORDS: Telescopes, Mirrors, Polishing, Optical spheres, Manufacturing, Autocollimation, Infrared telescopes, Spherical lenses, Zerodur, Surface finishing

Read Abstract +

Proceedings Article | 29 October 1999 Paper

Postupgrade performance of the 3.8-m United Kingdom Infrared Telescope (UKIRT)

Timothy Hawarden, Nicholas Rees, Timothy Chuter, Antonio Chrysostomou, Charles Cavedoni, Ralf-Rainer Rohloff, Eckhart Pitz, Donald Pettie, Richard Bennett, Eli Ettedgui-Atad

Proc. SPIE. 3785, Advanced Telescope Design, Fabrication, and Control

KEYWORDS: Actuators, Telescopes, Mirrors, Stars, Fluctuations and noise, Manufacturing, Adaptive optics, Image quality, Infrared telescopes, Secondary tip-tilt mirrors

Read Abstract +

Proceedings Article | 11 September 1998 Paper

ALFA: the MPIA/MPE adaptive optics with a laser for astronomy project

Stefan Hippler, Andreas Glindemann, Markus Kasper, Paul Kalas, Ralf-Rainer Rohloff, Karl Wagner, Douglas Looze, Wolfgang Hackenberg

Proc. SPIE. 3353, Adaptive Optical System Technologies

KEYWORDS: Actuators, Telescopes, Mirrors, Digital signal processing, Stars, Cameras, Sensors, Adaptive optics, Control systems, Deformable mirrors

Read Abstract +

Proceedings Article | 25 August 1998 Paper

Upgraded UKIRT

Timothy Hawarden, Nicholas Rees, Charles Cavedoni, Timothy Chuter, Antonio Chrysostomou, Donald Pettie, Richard Bennett, Eli Ettedgui-Atad, John Harris, Brian Mack, Eckhart Pitz, Andreas Glindemann, Stefan Hippler, Ralf-Rainer Rohloff, Karl Wagner

Proc. SPIE. 3352, Advanced Technology Optical/IR Telescopes VI

KEYWORDS: Actuators, Diffraction, Monochromatic aberrations, Telescopes, Mirrors, Astronomy, Stars, Ions, Domes, Tin

Read Abstract +

Proceedings Article | 21 March 1997 Paper

Progress of the UKIRT Upgrades Program

Timothy Hawarden, Charles Cavedoni, Timothy Chuter, Ivan Look, Nicholas Rees, Donald Pettie, Richard Bennett, Eli Ettedgui-Atad, John Harris, Colin Humphries, Brian Mack, Eckhart Pitz, Andreas Glindemann, Stefan Hippler, Ralf-Rainer Rohloff, Karl Wagner

Proc. SPIE. 2871, Optical Telescopes of Today and Tomorrow

KEYWORDS: Cooling systems, Diffraction, Monochromatic aberrations, Telescopes, Mirrors, Imaging systems, Wavefronts, Control systems, Domes, Active optics

Read Abstract +

Proceedings Article | 1 June 1994 Paper

Five-axis secondary system for UKIRT

Eckhart Pitz, Ralf-Rainer Rohloff, Stefan Hippler, Karl Wagner, Harry Marth

Proc. SPIE. 2199, Advanced Technology Optical Telescopes V

KEYWORDS: Actuators, Telescopes, Mirrors, Electronics, Imaging systems, Cameras, Interfaces, Control systems, CCD cameras, Electromechanical design

Read Abstract +

Proceedings Article | 1 June 1994 Paper

UKIRT upgrades program: preparing for the 21st century

Timothy Hawarden, Charles Cavedoni, Nicholas Rees, Timothy Chuter, Donald Pettie, Colin Humphries, Richard Bennett, E. Etad, John Harris, Brian Mack, Eckhart Pitz, Andreas Glindemann, Ralf-Rainer Rohloff

Proc. SPIE. 2199, Advanced Technology Optical Telescopes V

KEYWORDS: Telescopes, Mirrors, Astronomy, Imaging systems, Sensors, Wavefront sensors, Control systems, Domes, Infrared telescopes, Secondary tip-tilt mirrors

Read Abstract +

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