TY  - CHAP
A1  - Rausch, Peter
A1  - Verpoort, Sven
A1  - Wittrock, Ulrich
T1  - Performance verification and environmental testing of a unimorph deformable mirror for space applications.
T2  - Proceedings of the 10th International Conference on Space Optics - ICSO, Tenerife, Spain
N2  - Concepts for future large space telescopes require an active optics system to mitigate aberrations caused by thermal deformation and gravitational release. Such a system would allow on-site correction of wave-front errors and ease the requirements for thermal and gravitational stability of the optical train. In the course of the ESA project "Development of Adaptive Deformable Mirrors for Space Instruments" we have developed a unimorph deformable mirror designed to correct for low-order aberrations and dedicated to be used in space environment. We briefly report on design and manufacturing of the deformable mirror and present results from performance verifications and environmental testing.
KW  - space optics
KW  - adaptive optics
KW  - deformable mirror
KW  - unimorph
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-7716
UR  - http://www.icsoproceedings.org
PB  - FH Münster
ER  - 
TY  - JOUR
A1  - Kazasidis, Orestis
A1  - Wittrock, Ulrich
T1  - Interferometric measurement of the temperature coefficient of the refractive index dn/dT and the coefficient of thermal expansion of Pr:YLF laser crystals
JF  - Opt. Expr.
N2  - We report interferometric measurements of the temperature coefficient of the refractive index (dn=dT) and the coefficient of thermal expansion (a) of a praseodymium-doped yttrium lithium fluoride (Pr:YLF) crystal and of a fused silica reference sample. Our phase-resolved interferometric method yields a large number of data points and thus allows a precise measurement and a good error estimation. Furthermore, both dn=dT and a are obtained simultaneously from a single measurement which reduces errors that can occur in separate measurements. Over the temperature range from 20 °C to 80 °C, the value of dn=dT of Pr:YLF decreases from -5.2 x 10-6 /K to -6.2 x 10-6 /K for the ordinary refractive index and from -7.6 x 10-6 /K to -8.6 x 10-6 /K for the extraordinary refractive index. The coefficient of thermal expansion for the a-axis of Pr:YLF increases from 16.4 x 10-6 /K to 17.8 x 10-6 /K over the same temperature range.
KW  - refractive index change
KW  - thermal expansion coefficient
KW  - laser crystal
KW  - praseodymium
KW  - yttrium lithium fluoride
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-7720
VL  - 22
SP  - 30683
EP  - 30696
PB  - Optical Society of America
ER  - 
TY  - JOUR
A1  - Vorholt, Christian
A1  - Wittrock, Ulrich
T1  - Intra-cavity pumped Yb:YAG thin-disk laser with 1.74% quantum defect
JF  - Opt. Lett.
N2  - We present, to the best of our knowledge, the first intracavity pumped Yb:YAG thin-disk laser. It operates at 1050.7 nm with a quantum defect of just 1.74% due to pumping at 1032.4 nm. Low absorption of the pump light at the pump wavelength of 1032.4 nm is compensated for by placing the disk inside the resonator of another Yb:YAG thin-disk laser which is diode-pumped at 940 nm. The intra-cavity pumped laser has an output power of 10.3 W and a slope efficiency of 8.3%
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-8284
VL  - 40
SP  - 4819
EP  - 4822
ER  - 
TY  - CHAP
A1  - Vorholt, Christian
A1  - Wittrock, Ulrich
T1  - Wavelength control by angle-tuning of the laser radiation in an intra-cavity pumped Yb:YAG thin-disk laser
T2  - Advanced Solid State Lasers (ASSL), paper AM5A.39
N2  - In an intra-cavity pumped thin-disk laser the pump radiation forms a standing wave pattern inside the intra-cavity pumped disk.We demonstrate experimentally that the grating period of the standing wave pattern of the pump radiation can control the laser wavelength.
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-8298
UR  - https://www.osapublishing.org/abstract.cfm?uri=ASSL-2015-AM5A.39
ER  -