Prof. Ulrich Wittrock Profile

Prof. Ulrich Wittrock

Professor at Fachhochschule Münster

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Publications (21)

Proceedings Article | 11 June 2021 Open Access

Vibration and shock testing of a 50 mm aperture unimorph deformable mirror

Sinje Leitz, Maximilian Gerhards, Sven Verpoort, Ulrich Wittrock, Maximilian Freudling, Andreas Grzesik, Markus Erhard, Pascal Hallibert

Proceedings Volume 11852, 118524N (2021) https://doi.org/10.1117/12.2599796

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Proceedings Article | 11 June 2021 Open Access

Space-qualified Piezo Based Deformable Mirror for future Instruments with Active Optics

Maximilian Freudling, Andreas Grzesik, Markus Erhard, Maximilian Gerhards, Sinje Leitz, Sven Verpoort, Ulrich Wittrock, Pascal Hallibert

Proceedings Volume 11852, 1185231 (2021) https://doi.org/10.1117/12.2599467

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Proceedings Article | 5 September 2019 Open Access

Unimorph deformable mirror for telescopes and laser applications

S. Verpoort, U. Wittrock

Proceedings Volume 10565, 105656G (2019) https://doi.org/10.1117/12.2552642

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Proceedings Article | 12 July 2019 Open Access

Image-based wavefront correction for space telescopes

Orestis Kazasidis, Sven Verpoort, Ulrich Wittrock

Proceedings Volume 11180, 111807Z (2019) https://doi.org/10.1117/12.2536206

KEYWORDS: Wavefronts, Monochromatic aberrations, Point spread functions, Modulation transfer functions, Spatial frequencies, Diffraction, Wavefront sensors, Space telescopes, Active optics, Image quality

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Proceedings Article | 28 May 2018 Paper

Algorithm design for image-based wavefront control without wavefront sensing

Orestis Kazasidis, Sven Verpoort, Ulrich Wittrock

Proceedings Volume 10695, 1069502 (2018) https://doi.org/10.1117/12.2312523

KEYWORDS: Monochromatic aberrations, Aberration correction, Space telescopes, Deformable mirrors, Point spread functions, Active optics

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Proceedings Article | 21 November 2017 Open Access

Novel concept for a 0.5-j laser pump source with high electro-optical efficiency

Klaus Albers, Ulrich Wittrock

Proceedings Volume 10567, 105670G (2017) https://doi.org/10.1117/12.2308183

KEYWORDS: Crystals, Diodes, Pulsed laser operation, Laser crystals, Fusion energy, Absorption, Amplifiers, Electro optics, Nd:YAG lasers, Beam shaping

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Proceedings Article | 21 November 2017 Open Access

Novel, compact, and simple ND:YVO4 laser with 12 W of CW optical output power and good beam quality

H. Zimer, B. Langer, U. Wittrock, F. Heine, U. Hildebrandt, S. Seel, R. Lange

Proceedings Volume 10568, 105681C (2017) https://doi.org/10.1117/12.2307957

KEYWORDS: Crystals, Laser crystals, Disk lasers, Semiconductor lasers, Composites, Solid state lasers, Resonators, Adaptive optics, Absorption, Continuous wave operation

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Proceedings Article | 20 November 2017 Open Access

Novel unimorph deformable mirror for space applications

Sven Verpoort, Peter Rausch, Ulrich Wittrock

Proceedings Volume 10564, 1056414 (2017) https://doi.org/10.1117/12.2309089

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Proceedings Article | 17 November 2017 Open Access

Performance verification and environmental testing of a unimorph deformable mirror for space applications

Peter Rausch, Sven Verpoort, Ulrich Wittrock

Proceedings Volume 10563, 105632Y (2017) https://doi.org/10.1117/12.2304178

KEYWORDS: Mirrors, Deformable mirrors, Sensors, Space mirrors, Astronomical imaging, Electrodes, Bridges, Glasses, Temperature metrology, Actuators

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Proceedings Article | 25 September 2017 Open Access

Talc a far-infrared 20m space telescope and the ELICSIR consortium to reach TRL 3

G. Durand, J. Amiaux, M. Sauvage, T. Martens, J. Austin, S. Chesne, C. Collette, J. Pareschi, Y. Penfornis, G. Valsecchi, U. Wittrock

Proceedings Volume 10562, 105623R (2017) https://doi.org/10.1117/12.2296208

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Proceedings Article | 29 July 2016 Paper

A development roadmap for critical technologies needed for TALC: a deployable 20m annular space telescope

Marc Sauvage, Jérome Amiaux, James Austin, Mara Bello, Giovanni Bianucci, Simon Chesné, Oberto Citterio, Christophe Collette, Sébastien Correia, Gilles Durand, Sergio Molinari, Giovanni Pareschi, Yann Penfornis, Giorgia Sironi, Giuseppe Valsecchi, Sven Verpoort, Ulrich Wittrock

Proceedings Volume 9904, 99041L (2016) https://doi.org/10.1117/12.2231867

KEYWORDS: Space telescopes, Mirrors, Telescopes, Active optics, Space telescopes, Telescopes, Active optics, Talc, Carbon, Astronomy, Manufacturing, Nickel, Optics manufacturing

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Astronomy is driven by the quest for higher sensitivity and improved angular resolution in order to detect fainter or smaller objects. The far-infrared to submillimeter domain is a unique probe of the cold and obscured Universe, harboring for instance the precious signatures of key elements such as water. Space observations are mandatory given the blocking effect of our atmosphere. However the methods we have relied on so far to develop increasingly larger telescopes are now reaching a hard limit, with the JWST illustrating this in more than one way (e.g. it will be launched by one of the most powerful rocket, it requires the largest existing facility on Earth to be qualified). With the Thinned Aperture Light Collector (TALC) project, a concept of a deployable 20 m annular telescope, we propose to break out of this deadlock by developing novel technologies for space telescopes, which are disruptive in three aspects: • An innovative deployable mirror whose topology, based on stacking rather than folding, leads to an optimum ratio of collecting area over volume, and creates a telescope with an eight times larger collecting area and three times higher angular resolution compared to JWST from the same pre-deployed volume; • An ultra-light weight segmented primary mirror, based on electrodeposited Nickel, Composite and Honeycomb stacks, built with a replica process to control costs and mitigate the industrial risks; • An active optics control layer based on piezo-electric layers incorporated into the mirror rear shell allowing control of the shape by internal stress rather than by reaction on a structure. We present in this paper the roadmap we have built to bring these three disruptive technologies to technology readiness level 3. We will achieve this goal through design and realization of representative elements: segments of mirrors for optical quality verification, active optics implemented on representative mirror stacks to characterize the shape correction capabilities, and mechanical models for validation of the deployment concept. Accompanying these developments, a strong system activity will ensure that the ultimate goal of having an integrated system can be met, especially in terms of (a) scalability toward a larger structure, and (b) verification philosophy.

Proceedings Article | 29 July 2016 Paper

Unimorph piezoelectric deformable mirrors for space telescopes

P. Rausch, S. Verpoort, U. Wittrock

Proceedings Volume 9904, 990468 (2016) https://doi.org/10.1117/12.2232548

KEYWORDS: Mirrors, Space telescopes, Deformable mirrors, Space mirrors, Actuators, Mirror structures, Space mirrors, Manufacturing, Electrodes, Monochromatic aberrations, Bridges

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Proceedings Article | 13 September 2012 Paper

Novel unimorph adaptive mirrors for astronomy applications

Peter Rausch, Sven Verpoort, Ulrich Wittrock

Proceedings Volume 8447, 844764 (2012) https://doi.org/10.1117/12.925966

KEYWORDS: Mirrors, Deformable mirrors, Electrodes, Space telescopes, Glasses, Astronomy, High power lasers, Mirror structures, Finite element methods, Telescopes

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Proceedings Article | 16 February 2012 Paper

Characterization of a miniaturized unimorph deformable mirror for high power CW-solid state lasers

Sven Verpoort, Peter Rausch, Ulrich Wittrock

Proceedings Volume 8253, 825309 (2012) https://doi.org/10.1117/12.908038

KEYWORDS: Mirrors, Electrodes, Coating, Deformable mirrors, Glasses, Reflectivity, Image segmentation, High power lasers, Dielectrics, Actuators

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Proceedings Article | 15 February 2011 Paper

Novel unimorph deformable mirror with monolithic tip-tilt functionality for solid state lasers

S. Verpoort, U. Wittrock

Proceedings Volume 7931, 793107 (2011) https://doi.org/10.1117/12.873763

KEYWORDS: Mirrors, Deformable mirrors, Electrodes, Glasses, Coating, Solid state lasers, High power lasers, Resonators, Wavefronts, Actuators

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Proceedings Article | 24 February 2009 Paper

Novel unimorph deformable mirror for solid state laser resonators

S. Verpoort, P. Welp, U. Wittrock

Proceedings Volume 7209, 72090N (2009) https://doi.org/10.1117/12.810135

KEYWORDS: Mirrors, Electrodes, Glasses, Finite element methods, Deformable mirrors, Solid state lasers, Resonators, High power lasers, Actuators, Adaptive optics

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Proceedings Article | 16 May 2007 Open Access

Adaptive optics at the PHELIX laser

Hans-Martin Heuck, Ulrich Wittrock, Jérôme Fils, Stefan Borneis, Klaus Witte, Udo Eisenbart, Dasa Javorkova, Vincent Bagnoud, Stefan Götte, Andreas Tauschwitz, Eckehard Onkels

Proceedings Volume 6584, 658402 (2007) https://doi.org/10.1117/12.723380

KEYWORDS: Optical amplifiers, Mirrors, Monochromatic aberrations, Wavefronts, Adaptive optics, Amplifiers, Laser systems engineering, Lamps, Telescopes, Deformable mirrors

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Proceedings Article | 23 January 2006 Paper

Adaptive laser resonator control with deformable MOEMS mirrors

Ulrich Wittrock, Petra Welp

Proceedings Volume 6113, 61130C (2006) https://doi.org/10.1117/12.652064

KEYWORDS: Mirrors, Resonators, Micromachined deformable membrane mirrors, Laser resonators, Actuators, Deformable mirrors, Genetic algorithms, Solid state lasers, Microopto electromechanical systems, Feedback signals

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Proceedings Article | 25 June 2003 Paper

Adaptive aberration control in laser amplifiers and laser resonators

Ulrich Wittrock, Ivo Buske, Hans Heuck

Proceedings Volume 4969, (2003) https://doi.org/10.1117/12.499281

KEYWORDS: Resonators, Transmission electron microscopy, Zernike polynomials, Mirrors, Laser resonators, Gaussian beams, Monochromatic aberrations, Optical amplifiers, Diffraction, Laser crystals

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Proceedings Article | 17 April 1995 Paper

Beam parameter products of unstable resonators

Ulrich Wittrock, S. Dong, Bernd Eppich, Q. Lue, Norbert Mueller, Horst Weber

Proceedings Volume 2375, (1995) https://doi.org/10.1117/12.206982

KEYWORDS: Resonators, CCD cameras, Laser resonators, Nd:YAG lasers, Mirrors, Optical testing, Near field, Fiber couplers, Bessel beams, Diffraction

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Proceedings Article | 16 August 1994 Paper

High-power solid state lasers with improved beam quality

Ulrich Wittrock, Georg Bostanjoglo, S. Dong, Bernd Eppich, T. Haase, Q. Lue, Norbert Mueller-Stolzenburg, O. Holst

Proceedings Volume 2206, (1994) https://doi.org/10.1117/12.184604

KEYWORDS: Resonators, Mirrors, Nd:YAG lasers, Rod lasers, Birefringence, Solid state lasers, Polarization, Phase shifts, Laser resonators, Confocal microscopy

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