Dr. Wolfgang K. Hackenberg Profile

Dr. Wolfgang K. Hackenberg

at European Southern Observatory

SPIE Involvement:

Author

Publications (43)

Proceedings Article | 30 August 2022 Poster + Paper

Poster + Paper

Development of a beam conditioning and diagnostics system for the Laser Guide Star Facility of the ELT

Ralph Pohl, Coen Blok, Kevin Simmelink, Ruben Biesheuvel, Steffen Resink, Jan Nijenhuis, Martijn van Riel, Fred Kamphues, Domenico Bonaccini Calia, Wolfgang Hackenberg

Proceedings Volume 12185, 121857K (2022) https://doi.org/10.1117/12.2629207

KEYWORDS: Computer aided design, Mirrors, Interfaces, Optics manufacturing, Error analysis, Wavefronts, Diagnostics, Coating, Polarization, Bolometers

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Proceedings Article | 29 August 2022 Presentation

Presentation

Novel 63W CW 589nm chirped laser for laser guide star adaptive optics

Domenico Bonaccini Calia, Wolfgang Hackenberg, Daoping Wei, Martin Enderlein, Sebastian Hepp, Wallace Clements, Frank Lison, Renate Hinterschuster

Proceedings Volume 12185, 121852X (2022) https://doi.org/10.1117/12.2630398

KEYWORDS: Laser guide stars, Continuous wave operation, Adaptive optics, Sodium, Laser development, Fiber lasers, Astronomical imaging, Stellar astronomy, Satellite communications, Raman spectroscopy

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Proceedings Article | 29 August 2022 Poster

Poster

CaNaPy: LGS-AO experimental facility for visible wavelengths

Domenico Bonaccini Calia, James Osborn, Pierre Haguenauer, Marcos Reyes, David Alaluf, Mauro Centrone, Noelia Martínez Rey, David Jenkins, Petr Janout, Marco Faccini, Alfio Puglisi, Andreas Jost, Guido Agapito, Renate Hinterschuster, Ralf Conzelmann, Ivan Guidolin, Matthew Townson, Marco Bonaglia, Enrico Pinna, Filippo Ambrosino, Luis Fernando Rodríguez Ramos, Wolfgang Hackenberg

Proceedings Volume 12185, 121857L (2022) https://doi.org/10.1117/12.2630337

KEYWORDS: Adaptive optics, Laser guide stars, Wavefront sensors, Telescopes, Pulsed laser operation, Sodium, Optical calibration, Lead, Laser systems engineering, Laser development

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Proceedings Article | 11 June 2021 Open Access

Open Access

Presentation + Paper

CaNaPy: SatComm LGS-AO experimental platform with laser uplink pre-compensation

D. Bonaccini Calia, M. Centrone, E. Pinna, D. Alaluf, N. Martinez, J. Osborn, W. Hackenberg, M. Townson, M. Faccini, A. Di Paola, L. F. Rodriguez Ramos, R. Speziali, M. Reyes, P. Janout, D. Jenkins, D. P. Wei, T. Fischer, J. Perdigues, W. R. L. Clements

Proceedings Volume 11852, 118521A (2021) https://doi.org/10.1117/12.2599233

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Proceedings Article | 11 June 2021 Open Access

Open Access

Poster + Presentation + Paper

Paving the way to daytime optical feeder links based on LGS assisted adaptive optics

D. Alaluf, M. Centrone, D. Bonaccini Calia, P. Suetterling, R. Speziali, M. Faccini, W. Hackenberg, J. Perdigues Armengol, A. Di Paola

Proceedings Volume 11852, 118525Y (2021) https://doi.org/10.1117/12.2600028

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Proceedings Article | 10 July 2018 Presentation + Paper

Presentation + Paper

Adaptive Optics Facility: from an amazing present to a brilliant future...

P.-Y. Madec, R. Arsenault, H. Kuntschner, J. Kolb, J.-F. Pirard, J. Paufique, P. La Penna, W. Hackenberg, E. Vernet, M. Suárez Valles, N. Hubin

Proceedings Volume 10703, 1070302 (2018) https://doi.org/10.1117/12.2312428

KEYWORDS: Adaptive optics, Telescopes, Image quality, Sensors, Mirrors, Cameras, Stars, Spectrographs, Laser guide stars, Tomography

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Proceedings Article | 27 July 2016 Paper

Paper

Comparison between observation and simulation of sodium LGS return flux with a 20W CW laser on Tenerife

R. Holzlöhner, D. Bonaccini Calia, D. Bello, D. Budker, M. Centrone, I. Guidolin, W. Hackenberg, S. Lewis, G. Lombardi, I. Montilla, F. Pedichini, F. Pedreros Bustos, T. Pfrommer, M. Reyes Garcia Talavera, S. Rochester

Proceedings Volume 9909, 99095E (2016) https://doi.org/10.1117/12.2233072

KEYWORDS: Sodium, Optical simulations, Laser guide stars, Continuous wave operation, Polarization, Laser systems engineering, Laser guide stars, Optical simulations, Magnetism, Laser processing, Fiber lasers, Laser applications

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Proceedings Article | 26 July 2016 Paper

Paper

Adaptive Optics Facility: control strategy and first on-sky results of the acquisition sequence

P.-Y. Madec, J. Kolb, S. Oberti, J. Paufique, P. La Penna, W. Hackenberg, H. Kuntschner, J. Argomedo, M. Kiekebusch, R. Donaldson, M. Suarez, R. Arsenault

Proceedings Volume 9909, 99090Z (2016) https://doi.org/10.1117/12.2231698

KEYWORDS: Adaptive optics, Telescopes, Mirrors, Laser guide stars, Active optics, Sensors, Stars, Control systems, Space telescopes, Actuators

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Proceedings Article | 7 August 2014 Paper

Paper

Assembly and test results of the AOF laser guide star units at ESO

W. Hackenberg, D. Bonaccini Calia, B. Buzzoni, M. Comin, C. Dupuy, F. Gago, I. Guidolin, R. Guzman, R. Holzloehner, L. Kern, J. Kirchbauer, S. Lewis, J. Lizon, S. McLay, T. Pfrommer, M. Quattri, J. Quentin, R. Ridings

Proceedings Volume 9148, 91483O (2014) https://doi.org/10.1117/12.2057167

KEYWORDS: Telescopes, Mirrors, Laser guide stars, Interfaces, Calibration, Adaptive optics, Wavefronts, Temperature metrology, Camera shutters, Lasers

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Proceedings Article | 21 July 2014 Paper

Paper

ESO adaptive optics facility progress and first laboratory test results

Robin Arsenault, Pierre-Yves Madec, Jérome Paufique, Paolo La Penna, Stefan Stroebele, Elise Vernet, Jean-Francois Pirard, Wolfgang Hackenberg, Harald Kuntschner, Johann Kolb, Nicolas Muller, Aurea Garcia-Rissmann, Miska Le Louarn, Paola Amico, Norbert Hubin, Jean-Louis Lizon, Rob Ridings, Pierre Haguenauer, Jose Abad, Gerhard Fischer, Volker Heinz, Mario Kiekebusch, Javier Argomedo, Ralf Conzelmann, Sebastien Tordo, Rob Donaldson, Christian Soenke, Philippe Duhoux, Enrico Fedrigo, Bernard Delabre, Andrea Jost, Michel Duchateau, Mark Downing, Javier Reyes Moreno, Antonio Manescau, Domenico Bonaccini Calia, Marco Quattri, Christophe Dupuy, Ivan Guidolin, Mauro Comin, Ronald Guzman, Bernard Buzzoni, Jutta Quentin, Steffan Lewis, Paul Jolley, Max Kraus, Thomas Pfrommer, Roberto Biasi, Daniele Gallieni, Remko Stuik, Wilhelm Kaenders, Bernhard Ernstberger, Axel Friedenauer

Proceedings Volume 9148, 914802 (2014) https://doi.org/10.1117/12.2054859

KEYWORDS: Adaptive optics, Telescopes, Cameras, Laser guide stars, Wavefront sensors, Calibration, Turbulence, Actuators, Stars, Space telescopes

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Proceedings Article | 13 September 2012 Paper

Paper

The ESO transportable LGS Unit for measurements of the LGS photon return and other experiments

D. Bonaccini Calia, I. Guidolin, A. Friedenauer, M. Hager, V. Karpov, T. Pfrommer, R. Holzlöhner, S. Lewis, W. Hackenberg, G. Lombardi, M. Centrone, F. Pedichini

Proceedings Volume 8450, 84501R (2012) https://doi.org/10.1117/12.926898

KEYWORDS: Telescopes, Sodium, Continuous wave operation, Pulsed laser operation, Polarization, Laser guide stars, Adaptive optics, Wavefront sensors, Wavefronts, Receivers

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Proceedings Article | 13 September 2012 Paper

Paper

ESO adaptive optics facility progress report

Robin Arsenault, Pierre-Yves Madec, Jerome Paufique, Paolo La Penna, Stefan Stroebele, Elise Vernet, Jean-Francois Pirard, Wolfgang Hackenberg, Harald Kuntschner, Lieselotte Jochum, Johann Kolb, Nicolas Muller, Miska Le Louarn, Paola Amico, Norbert Hubin, Jean-Louis Lizon, Rob Ridings, Jose Abad, Gert Fischer, Volker Heinz, Mario Kiekebusch, Javier Argomedo, Ralf Conzelmann, Sebastien Tordo, Robert Donaldson, Christian Soenke, Philippe Duhoux, Enrico Fedrigo, Bernard Delabre, Andreas Jost, Michel Duchateau, Mark Downing, Javier Moreno, Reinhold Dorn, Antonio Manescau, Domenico Bonaccini Calia, Marco Quattri, Christophe Dupuy, Ivan Guidolin, Mauro Comin, Ronald Guzman, Bernard Buzzoni, Jutta Quentin, Steffan Lewis, Paul Jolley, Maximilian Kraus, Thomas Pfrommer, Roberto Biasi, Daniele Gallieni, Clementine Bechet, Remko Stuik

Proceedings Volume 8447, 84470J (2012) https://doi.org/10.1117/12.926074

KEYWORDS: Telescopes, Adaptive optics, Mirrors, Space telescopes, Wavefront sensors, Sensors, Optics manufacturing, Actuators, Control systems, Interfaces

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Proceedings Article | 28 July 2010 Paper

Paper

Laser guide star return flux simulations based on observed sodium density profiles

Ronald Holzlöhner, Simon Rochester, Thomas Pfrommer, Domenico Bonaccini Calia, Dmitry Budker, James Higbie, Wolfgang Hackenberg

Proceedings Volume 7736, 77360V (2010) https://doi.org/10.1117/12.856721

KEYWORDS: Sodium, Optical simulations, Mesosphere, Telescopes, Laser guide stars, Tantalum, Magnetism, Chemical species, Adaptive optics, Device simulation

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Proceedings Article | 28 July 2010 Paper

Paper

Manufacturing of the ESO adaptive optics facility

R, Arsenault, P.-Y. Madec, N. Hubin, S. Stroebele, J. Paufique, E. Vernet, W. Hackenberg, J.-F. Pirard, L. Jochum, A. Glindemann, A. Jost, R. Conzelmann, M. Kiekebusch, S. Tordo, J.-L. Lizon, R. Donaldson, E. Fedrigo, C. Soenke, M. Duchateau, A. Bruton, B. Delabre, M. Downing, J. Reyes, J. Kolb, C. Bechet, M. Lelouarn, D. Bonaccini Calia, M. Quattri, I. Guidolin, B. Buzzoni, C. Dupuy, R. Guzman, M. Comin, A. Silber, J. Quentin, P. La Penna, A. Manescau, P. Jolley, V. Heinz, P. Duhoux, J. Argomedo, D. Gallieni, P. Lazzarini, R. Biasi, M. Andrighettoni, G. Angerer, D. Pescoller, R, Stuik, A. Deep

Proceedings Volume 7736, 77360L (2010) https://doi.org/10.1117/12.857973

KEYWORDS: Telescopes, Adaptive optics, Mirrors, Laser guide stars, Sensors, Optics manufacturing, Real-time computing, Manufacturing, Actuators, Cameras

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Proceedings Article | 10 July 2008 Paper

Paper

ESO adaptive optics facility

R. Arsenault, P.-Y. Madec, N. Hubin, J. Paufique, S. Stroebele, C. Soenke, R. Donaldson, E. Fedrigo, S. Oberti, S. Tordo, M. Downing, M. Kiekebusch, R. Conzelmann, M. Duchateau, A. Jost, W. Hackenberg, D. Bonaccini Calia, B. Delabre, R. Stuik, R. Biasi, D. Gallieni, P. Lazzarini, M. Lelouarn, A. Glindeman

Proceedings Volume 7015, 701524 (2008) https://doi.org/10.1117/12.790359

KEYWORDS: Adaptive optics, Telescopes, Mirrors, Sensors, Stars, Laser guide stars, Sodium, Deformable mirrors, Space telescopes, Wavefront sensors

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Proceedings Article | 10 July 2008 Paper

Paper

Physical optics modeling and optimization of laser guide star propagation

Ronald Holzlöhner, Domenico Bonaccini Calia, Wolfgang Hackenberg

Proceedings Volume 7015, 701521 (2008) https://doi.org/10.1117/12.790907

KEYWORDS: Sodium, Atmospheric propagation, Telescopes, Adaptive optics, Device simulation, Point spread functions, Wavefront sensors, Turbulence, Light wave propagation, Wave propagation

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Proceedings Article | 10 July 2008 Paper

Paper

Effect of the geomagnetic field on the intensity of sodium laser guide stars

N. Moussaoui, R. Holzlöhner, W. Hackenberg, D. Bonaccini Calia

Proceedings Volume 7015, 70152W (2008) https://doi.org/10.1117/12.803921

KEYWORDS: Sodium, Magnetism, Chemical species, Optical pumping, Laser guide stars, Absorption, Laser beam propagation, Polarization, Telescopes, Electrons

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Proceedings Article | 4 July 2006 Paper

Paper

First light of the ESO laser guide star facility

D. Bonaccini Calia, E. Allaert, J. Alvarez, C. Araujo Hauck, G. Avila, E. Bendek, B. Buzzoni, M. Comin, M. Cullum, R. Davies, M. Dimmler, I. Guidolin, W. Hackenberg, S. Hippler, S. Kellner, A. van Kesteren, F. Koch, U. Neumann, T. Ott, D. Popovic, F. Pedichini, M. Quattri, J. Quentin, S. Rabien, A. Silber, M. Tapia

Proceedings Volume 6272, 627207 (2006) https://doi.org/10.1117/12.674484

KEYWORDS: Telescopes, Sodium, Laser guide stars, Adaptive optics, Fiber lasers, LIDAR, Scattering, Continuous wave operation, Laser scattering, Observatories

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Proceedings Article | 28 June 2006 Paper

Paper

AFIRE: fiber Raman laser for laser guide star adaptive optics

D. Bonaccini Calia, W. Hackenberg, S. Chernikov, Y. Feng, L. Taylor

Proceedings Volume 6272, 62721M (2006) https://doi.org/10.1117/12.674487

KEYWORDS: Fiber lasers, Raman spectroscopy, Polarization, Laser guide stars, Adaptive optics, Optical amplifiers, Fiber amplifiers, Second-harmonic generation, Crystals

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Proceedings Article | 27 June 2006 Paper

Paper

Ultra-low loss hollow-core photonic crystal fibers at 589 nm for LGS-assisted AO

Ronald Holzlöhner, Brian Mangan, Domenico Bonaccini Calia, Wolfgang Hackenberg

Proceedings Volume 6272, 62724B (2006) https://doi.org/10.1117/12.673179

KEYWORDS: Signal attenuation, Cladding, Photonic crystal fibers, Structured optical fibers, Finite element methods, Glasses, Adaptive optics, Capillaries, Sodium, Laser guide stars

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Proceedings Article | 27 June 2006 Paper

Paper

Design of a narrow band 589 nm laser by direct Raman shift in single mode fiber

Yan Feng, Domenico Bonaccini Calia, Wolfgang Hackenberg, Stanislav Chernikov

Proceedings Volume 6272, 62724A (2006) https://doi.org/10.1117/12.673174

KEYWORDS: Raman spectroscopy, Fiber Bragg gratings, Fiber lasers, Reflectivity, Single mode fibers, Optical simulations, Laser scattering, Solid state lasers, Solid state electronics, Raman scattering

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Proceedings Article | 27 June 2006 Paper

Paper

The ESO Adaptive Optics Facility

S. Ströbele, R. Arsenault, R. Bacon, R. Biasi, D. Bonaccini-Calia, M. Downing, R. Conzelmann, B. Delabre, R. Donaldson, M. Duchateau, S. Esposito, E. Fedrigo, D. Gallieni, W. Hackenberg, N. Hubin, M. Kasper, M. Kissler-Patig, M. Le Louarn, R. McDermid, S. Oberti, J. Paufique, A. Riccardi, R. Stuik, E. Vernet

Proceedings Volume 6272, 62720B (2006) https://doi.org/10.1117/12.672289

KEYWORDS: Adaptive optics, Telescopes, Mirrors, Actuators, Digital signal processing, Calibration, Sensors, Galactic astronomy, Field programmable gate arrays, Deformable mirrors

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Proceedings Article | 27 June 2006 Paper

Paper

Resonant electro-optical modulator for high laser-power single-mode fiber relay

W. Hackenberg, M. Zaehringer, A. Silber

Proceedings Volume 6272, 62724D (2006) https://doi.org/10.1117/12.673190

KEYWORDS: Modulators, Crystals, Fiber lasers, Relays, Electrooptic modulators, Laser guide stars, Electro optics, Phase shifts, Single mode fibers, Modulation

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Proceedings Article | 27 June 2006 Paper

Paper

Multi-watt 589-nm Na D₂-line generation via frequency doubling of a Raman fiber amplifier: a source for LGS-assisted AO

L. Taylor, Y. Feng, D. Bonaccini Calia, W. Hackenberg

Proceedings Volume 6272, 627249 (2006) https://doi.org/10.1117/12.673087

KEYWORDS: Second-harmonic generation, Adaptive optics, Raman spectroscopy, Data conversion, Absorption, Fiber amplifiers, Fiber lasers, Sodium, Visible radiation

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Proceedings Article | 25 October 2004 Paper

Paper

Cone-effect-free adaptive optics laser guide star development for the ELTs

Domenico Bonaccini Calia, Richard Myers, Franco Zappa, Gordon Love, Timothy Morris, Wolfgang Hackenberg, Richard Wilson, David Buscher

Proceedings Volume 5490, (2004) https://doi.org/10.1117/12.553109

KEYWORDS: Telescopes, Sensors, Adaptive optics, Wavefront sensors, Mirrors, Wavefronts, Laser guide stars, Pulsed laser operation, Visibility, Atmospheric propagation

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Proceedings Article | 25 October 2004 Paper

Paper

Laser-guide-star-related activities at ESO

Domenico Bonaccini Calia, Wolfgang Hackenberg, Constanza Araujo, Ivan Guidolin, Jose Alvarez

Proceedings Volume 5490, (2004) https://doi.org/10.1117/12.552947

KEYWORDS: Telescopes, Fiber lasers, Relays, Laser guide stars, Adaptive optics, Photonic crystal fibers, Diffraction, Laser development, Space telescopes, Raman spectroscopy

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Proceedings Article | 3 July 2003 Paper

Paper

High-power 938-nm cladding pumped fiber laser

Jay Dawson, Alex Drobshoff, Zhi Liao, Raymond Beach, Deanna Pennington, Stephen Payne, Luke Taylor, Wolfgang Hackenberg, Domenico Bonaccini

Proceedings Volume 4974, (2003) https://doi.org/10.1117/12.478270

KEYWORDS: Fiber lasers, Fiber amplifiers, Optical amplifiers, Cladding, Neodymium, Absorption, Optical fibers, Signal attenuation, Semiconductor lasers, Ions

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Proceedings Article | 7 February 2003 Paper

Paper

The VLT laser guide star facility

Domenico Bonaccini, Eric Allaert, Constanza Araujo, Enzo Brunetto, Bernard Buzzoni, Mauro Comin, Martin Cullum, Richard Davies, Canio Dichirico, Philippe Dierickx, Martin Dimmler, Michel Duchateau, Carsten Egedal, Wolfgang Hackenberg, Stefan Hippler, Stefan Kellner, Arno van Kesteren, Franz Koch, Udo Neumann, Thomas Ott, Marco Quattri, Jutta Quentin, Sebastian Rabien, Roberto Tamai, Mario Tapia, Massimo Tarenghi

Proceedings Volume 4839, (2003) https://doi.org/10.1117/12.459277

KEYWORDS: Telescopes, Relays, Laser guide stars, Continuous wave operation, Adaptive optics, Dye lasers, Diagnostics, Laser safety, Safety, Electronics

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Proceedings Article | 7 February 2003 Paper

Paper

Operational issues for PARSEC, the VLT laser

Richard Davies, Thomas Ott, Jianlang Li, Sebastian Rabien, Udo Neumann, Stefan Hippler, Domenico Bonaccini, Wolfgang Hackenberg

Proceedings Volume 4839, (2003) https://doi.org/10.1117/12.459068

KEYWORDS: Mirrors, Optical amplifiers, Sodium, Laser guide stars, Telescopes, Cameras, Observatories, Absorption, Fabry–Perot interferometers, Control systems

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Proceedings Article | 7 February 2003 Paper

Paper

Fiber Raman laser development for multiple sodium laser guide star adaptive optics

Wolfgang Hackenberg, Domenico Bonaccini, Daniela Werner

Proceedings Volume 4839, (2003) https://doi.org/10.1117/12.458930

KEYWORDS: Raman spectroscopy, Fiber amplifiers, Fiber lasers, Optical amplifiers, Laser guide stars, Crystals, Sodium, Adaptive optics, Amplifiers, Second-harmonic generation

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Proceedings Article | 4 February 2002 Paper

Paper

ESO VLT laser guide star facility

Domenico Bonaccini, Wolfgang Hackenberg, Martin Cullum, Enzo Brunetto, Thomas Ott, Marco Quattri, Eric Allaert, Martin Dimmler, Massimo Tarenghi, Arno van Kesteren, Canio Dichirico, Bernard Buzzoni, Peter Gray, Roberto Tamai, Mario Tapia

Proceedings Volume 4494, (2002) https://doi.org/10.1117/12.454802

KEYWORDS: Telescopes, Relays, Mirrors, Adaptive optics, Information operations, Laser guide stars, Lawrencium, Diagnostics, Laser safety, Safety

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Proceedings Article | 4 February 2002 Paper

Paper

Fiber Raman laser development for multiconjugate adaptive optics with sodium laser guide stars

Wolfgang Hackenberg, Domenico Bonaccini

Proceedings Volume 4494, (2002) https://doi.org/10.1117/12.454801

KEYWORDS: Fiber lasers, Raman spectroscopy, Fiber Bragg gratings, Adaptive optics, Hydrogen, Laser development, Sodium, Laser guide stars, Solid state lasers, Stars

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Proceedings Article | 4 February 2002 Paper

Paper

Modular concept for ELT adaptive optics

Domenico Bonaccini, Wolfgang Hackenberg

Proceedings Volume 4494, (2002) https://doi.org/10.1117/12.454813

KEYWORDS: Adaptive optics, Sensors, Diffraction, Mirrors, Atmospheric modeling, Point spread functions, Telescopes, Stars, Deformable mirrors, Computing systems

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Proceedings Article | 7 July 2000 Paper

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

Proceedings Volume 4007, (2000) https://doi.org/10.1117/12.390318

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

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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 | 7 July 2000 Paper

Paper

Single-mode fiber relay for the ESO laser guide star facility

Wolfgang Hackenberg, Domenico Bonaccini

Proceedings Volume 4007, (2000) https://doi.org/10.1117/12.390327

KEYWORDS: Fiber lasers, Sodium, Single mode fibers, Relays, Polarization, Scattering, Laser guide stars, Light scattering, Chemical species, Telescopes

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Proceedings Article | 27 September 1999 Paper

Paper

Calar Alto ALFA and the sodium laser guide star in astronomy

David Butler, Richard Davies, Hayden Fews, Wolfgang Hackenberg, Sebastian Rabien, Thomas Ott, Andreas Eckart, Markus Kasper

Proceedings Volume 3762, (1999) https://doi.org/10.1117/12.363573

KEYWORDS: Sodium, Stars, Laser guide stars, Adaptive optics, Galactic astronomy, Telescopes, Astronomy, Mirrors, Sensors, Wavefronts

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Proceedings Article | 27 September 1999 Paper

Paper

Beam quality and polarization analysis of the ALFA laser at Calar Alto and the influence on brightness and size of the laser guide star

Sebastian Rabien, Richard Davies, Wolfgang Hackenberg, Andreas Eckart, Thomas Ott, David Butler

Proceedings Volume 3762, (1999) https://doi.org/10.1117/12.363594

KEYWORDS: Telescopes, Polarization, Sodium, Laser guide stars, Adaptive optics, Stars, Mirrors, Wavefronts, Distortion, Polarimetry

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Proceedings Article | 11 September 1998 Paper

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

Proceedings Volume 3353, (1998) https://doi.org/10.1117/12.321708

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

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Proceedings Article | 11 September 1998 Paper

Paper

ALFA: first operational experience of the MPE/MPIA laser guide star system for adaptive optics

Richard Davies, Wolfgang Hackenberg, Thomas Ott, Andreas Eckart, Hans-Christoph Holstenberg, Sebastian Rabien, Andreas Quirrenbach, Markus Kasper

Proceedings Volume 3353, (1998) https://doi.org/10.1117/12.321747

KEYWORDS: Telescopes, Adaptive optics, Sodium, Stars, Laser guide stars, Wavefront sensors, Mirrors, Polarization, Laser systems engineering, Optical benches

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Proceedings Article | 11 September 1998 Paper

Paper

Laser guide star facility for the ESO VLT

Domenico Bonaccini, Wolfgang Hackenberg, Gerardo Avila

Proceedings Volume 3353, (1998) https://doi.org/10.1117/12.321652

KEYWORDS: Telescopes, Fiber lasers, Relays, Adaptive optics, Mirrors, Laser guide stars, Observatories, Single mode fibers, Semiconductor lasers, Continuous wave operation

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Proceedings Article | 17 October 1997 Paper

Paper

Sodium laser guide star system of ALFA

Andreas Quirrenbach, Wolfgang Hackenberg, Hans-Christoph Holstenberg, Norbert Wilnhammer

Proceedings Volume 3126, (1997) https://doi.org/10.1117/12.279051

KEYWORDS: Telescopes, Sodium, Dye lasers, Mirrors, Space telescopes, Laser systems engineering, Laser guide stars, Adaptive optics, Stars, Control systems

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Proceedings Article | 21 October 1992 Paper

Paper

Polarization effects in hot-electron luminescence from GaAs

Wolfgang Hackenberg, H. Hughes, Gerhard Fasol, Hiroyuki Kano

Proceedings Volume 1677, (1992) https://doi.org/10.1117/12.137690

KEYWORDS: Polarization, Luminescence, Photons, Phonons, Gallium arsenide, Transition metals, Optical components, Optical alignment, Crystals, Spectroscopy

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Proceedings Article | 1 August 1990 Paper

Paper

Gamma -> L intervalley and polar optic scattering times in GaAs from cw hot electron luminescence spectroscopy

Wolfgang Hackenberg, Gerhard Fasol, Elisabeth Bauser, Klaus Ploog

Proceedings Volume 1282, (1990) https://doi.org/10.1117/12.20708

KEYWORDS: Scattering, Luminescence, Phonons, Gallium arsenide, Laser scattering, Semiconductors, Spectroscopy, Laser beam diagnostics, Ultrafast lasers

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Showing 5 of 43 publications

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