Prof. Claus Braxmaier Profile

Prof. Claus Braxmaier

at Hochschule Konstanz

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Author

Publications (18)

Proceedings Article | 12 August 2019 Open Access

Frequency stabilized ND:YAG laser for space applications

Thilo Schuldt, Claus Braxmaier, Holger Müller, Günter Huber, Achim Peters, Ulrich Johann

Proceedings Volume 10568, 105682Z (2019) https://doi.org/10.1117/12.2307968

KEYWORDS: Modulation, Laser stabilization, Iodine cells, Iodine, Spectroscopy, Nd:YAG lasers, Laser beam diagnostics, Frequency modulation, Polarization, Standards development

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Proceedings Article | 5 January 2018 Open Access

The space-time explorer and quantum test of the equivalence principle mission (STE-QUEST)

Naceur Gaaloul, W. Ertmer, E. Rasel, Claus Braxmaier, Arnaud Landragin, Philippe Bouyer, Kai Bongs, Guglielmo Tino

Proceedings Volume 10564, 105641L (2018) https://doi.org/10.1117/12.2309242

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Proceedings Article | 21 November 2017 Open Access

A high sensitivity heterodyne interferometer as a possible optical readout for the LISA gravitational reference sensor and its application to technology verification

Martin Gohlke, Thilo Schuldt, Dennis Weise, Jorge Cordero, Achim Peters, Ulrich Johann, Claus Braxmaier

Proceedings Volume 10566, 1056612 (2017) https://doi.org/10.1117/12.2308257

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Proceedings Article | 21 November 2017 Open Access

Novel payload architectures for LISA

Ulrich Johann, Claus Braxmaier, Wolfgang Holota, Hartmut Jörck

Proceedings Volume 10567, 105670P (2017) https://doi.org/10.1117/12.2308123

KEYWORDS: Nanoimprint lithography, Interferometers, Sensors, Telescopes, Space telescopes, Optical benches, Heterodyning, Space operations, Laser interferometry, Actuators

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The present LISA (Laser Interferometer Space Antenna) gravitational wave detector concept features three satellites in individual earth trailing helio-centric orbits, which are linked by bi-directional monostatic laser interferometry between free-falling inertial reference masses inside the payload. The spacecrafts are maintaining an equilateral triangular constellation with 5 Million km armlength. The optical payload consists in the present configuration out of two assemblies, each one comprising a telescope, an optical bench and an inertial sensor and serving one arm of the adjacent interferometers. Due to orbital distortions, the constellation triangle is not perfectly maintained, but the line of sights offset angle is slowly changing during a one year revolution by 60°±0.75°. This variation is far beyond the diffraction limited beam width (2.5 μrad) and hence requires active compensation presently done by actuation of the complete assemblies. While allowing almost stationary on-axis operation of the optics, the arrangement requires two separate active inertial sensors, a rather sophisticated optical interfacing between the interferometer arms and active electrostatic suspension of the test masses in all but one degree of freedom.

We identified an alternative architecture, characterized by a single operational inertial sensor and a single optical bench serving both adjacent interferometer arms. Both telescopes are rigidly fixed to the optical bench and the angular breathing is accommodated by in-field of view pointing of transmit and receive beams via on-bench actuation mechanisms. Only attitude electrostatic actuation of the test mass is required, which can be kept otherwise in free fall. Such an architecture requires a decoupled inter- and intraspacecraft metrology in two steps linked via optical bench fiducial points (strap-down). Peculiar technical challenges are the actuation mechanism and the inherent metrology to calibrate or compensate within the LISA measurement band –at pm and nrad resolution- for laser phase and pointing changes, respectively, inside the optical assembly.

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Proceedings Article | 21 November 2017 Open Access

Optical metrology subsystem of the LISA gravitational wave detector

Dennis Weise, Claus Braxmaier, Peter Gath, Hans Reiner Schulte, Ulrich Johann

Proceedings Volume 10567, 105670Q (2017) https://doi.org/10.1117/12.2308037

KEYWORDS: Optical benches, Nanoimprint lithography, Telescopes, Space telescopes, Interferometers, Space operations, Interferometry, Beam splitters, Photodiodes, Metrology

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Proceedings Article | 21 November 2017 Open Access

A heterodyne interferometer for high resolution translation and tilt measurement as optical readout for the LISA inertial sensor

Thilo Schuldt, Hans-Jürgen Kraus, Dennis Weise, Claus Braxmaier, Achim Peters, Ulrich Johann

Proceedings Volume 10567, 105673M (2017) https://doi.org/10.1117/12.2308065

KEYWORDS: Interferometers, Nanoimprint lithography, Mirrors, Heterodyning, Beam splitters, Photodiodes, Sensors, Optical testing, Satellites, Diodes

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Proceedings Article | 21 November 2017 Open Access

All-fiber-coupled, master oscillator fiber power amplifier based laser assembly for the LISA gravitational wave detector

Dennis Weise, Jens Limpert, Thomas Schreiber, Claus Braxmaier, Christian Wuhrer, Peter Gath, Hans-Reiner Schulte, Andreas Tünnermann, Ulrich Johann

Proceedings Volume 10567, 105671B (2017) https://doi.org/10.1117/12.2308038

KEYWORDS: Nanoimprint lithography, Laser systems engineering, Fiber amplifiers, Optical benches, Oscillators, Fiber lasers, Laser stabilization, Optical amplifiers, Space operations, Switches

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Proceedings Article | 20 November 2017 Open Access

Dual absolute and relative high precision laser metrology

Klaus Ergenzinger, Thilo Schuldt, Philippe Berlioz, Claus Braxmaier, Ulrich Johann

Proceedings Volume 10565, 105652R (2017) https://doi.org/10.1117/12.2309252

KEYWORDS: Laser metrology, Space telescopes, Telescopes, Laser stabilization, Metrology, Head, Astronomical imaging, Nanoimprint lithography, Laser development, Distance measurement

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Proceedings Article | 13 September 2012 Paper

CTE measurement setup with 10 ppb/K sensitivity for characterizing lightweight and highly stable materials for space applications

Ruven Spannagel, Martin Gohlke, Thilo Schuldt, Ulrich Johann, Dennis Weise, Claus Braxmaier

Proceedings Volume 8450, 84500Q (2012) https://doi.org/10.1117/12.926061

KEYWORDS: Mirrors, Zerodur, Temperature metrology, Interferometers, Heterodyning, Mirror mounts, Computer aided design, Space telescopes, Beam splitters, Optical testing

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Proceedings Article | 17 February 2010 Paper

Development of a tilt actuated micromirror for applications in laser interferometry

Wolfgang Kronast, Ulrich Mescheder, Bernhard Müller, Antwi Nimo, Claus Braxmaier, Thilo Schuldt

Proceedings Volume 7594, 75940O (2010) https://doi.org/10.1117/12.839577

KEYWORDS: Mirrors, Semiconducting wafers, Micromirrors, Electrodes, Finite element methods, Silicon, Deep reactive ion etching, Laser interferometry, Space operations, Nanoimprint lithography

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Proceedings Article | 17 June 2009 Paper

Development of an ultrasensitive interferometry system as a key to precision metrology applications

Martin Gohlke, Thilo Schuldt, Dennis Weise, Ulrich Johann, Achim Peters, Claus Braxmaier

Proceedings Volume 7389, 73890V (2009) https://doi.org/10.1117/12.827586

KEYWORDS: Metrology, Interferometers, Mirrors, Interferometry, Phase modulation, Glasses, Bragg cells, Actuators, Information operations, Optical testing

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Proceedings Article | 17 November 2008 Paper

A heterodyne interferometer for high-performance industrial metrology

Thilo Schuldt, Martin Gohlke, Dennis Weise, Ulrich Johann, Achim Peters, Claus Braxmaier

Proceedings Volume 7266, 72660M (2008) https://doi.org/10.1117/12.805051

KEYWORDS: Interferometers, Heterodyning, Mirrors, Beam splitters, Nanoimprint lithography, Bragg cells, Photodiodes, Sensors, Optical testing, Head

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Proceedings Article | 23 July 2008 Paper

Picometer resolution interferometric characterization of the dimensional stability of zero CTE CFRP

Jorge Cordero Machado, Thomas Heinrich, Thilo Schuldt, Martin Gohlke, Stefano Lucarelli, Dennis Weise, Ulrich Johann, Achim Peters, Claus Braxmaier

Proceedings Volume 7018, 70183D (2008) https://doi.org/10.1117/12.789495

KEYWORDS: Mirrors, Space telescopes, Interferometers, Temperature metrology, Telescopes, Nanoimprint lithography, Heterodyning, Beam splitters, Interferometry, Space operations

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Proceedings Article | 30 April 2008 Paper

A compact high-sensitivity heterodyne interferometer for industrial metrology

Thilo Schuldt, Martin Gohlke, Dennis Weise, Achim Peters, Ulrich Johann, Claus Braxmaier

Proceedings Volume 7003, 70030Y (2008) https://doi.org/10.1117/12.781336

KEYWORDS: Interferometers, Heterodyning, Beam splitters, Photodiodes, Optical testing, Nanoimprint lithography, Mirrors, Sensors, Actuators, Head

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Proceedings Article | 18 June 2007 Paper

Adopting our heterodyne interferometer with sub-nm sensitivity for industrial position metrology

Thilo Schuldt, Martin Gohlke, Dennis Weise, Achim Peters, Ulrich Johann, Claus Braxmaier

Proceedings Volume 6616, 661649 (2007) https://doi.org/10.1117/12.726180

KEYWORDS: Interferometers, Heterodyning, Beam splitters, Nanoimprint lithography, Mirrors, Optical testing, Space operations, Sensors, Photodiodes, Diodes

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SPIE Journal Paper | 1 December 2006

Prototype optical bench instrument in the interferometer for the LISA–Pathfinder space mission

Kevin Middleton, Martin Caldwell, Ruben Edeson, C. Neeson, G. Munro, C. Eley, Michael Sandford, Claus Braxmaier, Ulrich Johann, Christian Killow, David Robertson, Harry Ward, James Hough, Gerhard Heinzel, V. Wand

OE, Vol. 45, Issue 12, 125601, (December 2006) https://doi.org/10.1117/12.10.1117/1.2405348

KEYWORDS: Interferometers, Optical benches, Optical alignment, Glasses, Photodiodes, Prototyping, Mirrors, Space operations, Interfaces, Optical engineering

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Proceedings Article | 14 August 2006 Paper

A high sensitivity heterodyne interferometer as optical readout for the LISA inertial sensor

Thilo Schuldt, Hans-Jürgen Kraus, Dennis Weise, Claus Braxmaier, Achim Peters, Ulrich Johann

Proceedings Volume 6293, 62930Z (2006) https://doi.org/10.1117/12.681567

KEYWORDS: Interferometers, Nanoimprint lithography, Heterodyning, Mirrors, Beam splitters, Sensors, Diodes, Satellites, Ferroelectric materials, Space operations

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Proceedings Article | 29 September 2004 Paper

LISA pathfinder optical interferometry

Claus Braxmaier, Gerhard Heinzel, Kevin Middleton, Martin Caldwell, W. Konrad, H. Stockburger, S. Lucarelli, Maurice te Plate, V. Wand, A. Garcia, F. Draaisma, J. Pijnenburg, D. Robertson, Christian Killow, Harry Ward, Karsten Danzmann, Ulrich Johann

Proceedings Volume 5500, (2004) https://doi.org/10.1117/12.555266

KEYWORDS: Interferometers, Nanoimprint lithography, Optical benches, Sensors, Zerodur, Interferometry, Optics manufacturing, Metrology, Optical interferometry, Mirrors

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Showing 5 of 18 publications

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