TY  - CHAP
A1  - Verpoort, Sven
A1  - Wittrock, Ulrich
T1  - Deformable mirrors for high power lasers
T2  - Proceedings of the 8th International Workshop on Adaptive Optics for Industry and Medicine (AOIM)
N2  - It has been shown that the beam quality and the efficiency of high-power solid-state lasers could be enhanced by the use of deformable mirrors in order to compensate for optical aberrations. An intracavity compensation requires a deformable mirror which is capable of handling very high laser intensities. The active diameter of the deformable mirror should be a few millimeters in order to match typical fundamental mode laser beam diameters. There is a wide variety of commercially available deformable mirrors, but neither meets all requirements.
KW  - Deformable mirror, adaptive mirror, unimorph mirror, high-power laser
Y1  - 2011
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-106953
UR  - http://congresos.um.es/aoim/aoim2011/schedConf/presentations
ER  - 
TY  - JOUR
A1  - Albers, Klaus
A1  - Wittrock, Ulrich
T1  - Optical pump concepts for highly efficient quasi-three-level lasers
JF  - Appl. Phys. B
N2  - Efficient quasi-three-level laser operation requires the generation of the highest possible pump rate from a given pump source. We derive the fundamental scaling laws for the pump rate and we extract optimization criteria for pump concepts from these laws. The analysis is then applied to the thin-disk laser. Based on the results, a novel pump concept for thin-disk lasers is proposed, which allows for several tens of pump beam passes and reduces the optical complexity of conventional pump concepts. Furthermore, the beam quality of the pump source is preserved almost completely, facilitating the highest possible pump rate.
Y1  - 2011
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-6467
VL  - 105
SP  - 245
EP  - 254
PB  - Springer
ER  - 
TY  - CHAP
A1  - Verpoort, Sven
A1  - Wittrock, Ulrich
T1  - Novel unimorph deformable mirror with monolithic tip-tilt functionality for solid state lasers
T2  - MEMS Adaptive Optics V, Proc. SPIE
N2  - We present a new type of unimorph deformable mirror with monolithic tip-tilt functionality. The tip-tilt actuation is based on a spiral arm design. The mirror will be used in high-power laser resonators for real-time intracavity phase control. The additional tip-tilt correction with a stroke up to 6 μm simplifies the resonator alignment significantly. The mirror is optimized for a laser beam footprint of about 10 mm. We have modeled and optimized this mirror by finite element calculations and we will present design criteria and tradeoffs for this mirrors. The mirror is manufactured from a super-polished glass substrate with very low surface scattering and excellent dielectric coating.
Y1  - 2011
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-6471
VL  - 7931
SP  - 793107
PB  - SPIE
ER  -