6 February 2012 Active mirrors for intra-cavity compensation of the aspherical thermal lens in thin-disk lasers
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With the development of the thin-disk laser, thermal lensing issues have been drastically reduced. However, fundamental mode operation at high output powers is still limited by severe efficiency reductions due to diffraction losses introduced by the temperature gradient at the boundary of the pump spot. To countervail these aspherical wavefront deformations, high-power laser mirrors featuring deformable surfaces have been developed. The surface of these mirrors resembles the shape of the thermally induced change of optical path length in the pumped laser crystal. The magnitude of the surface deformation can be actively controlled to provide optimal compensation at different power levels.
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Stefan Piehler, Stefan Piehler, Birgit Weichelt, Birgit Weichelt, Andreas Voss, Andreas Voss, Marwan Abdou Ahmed, Marwan Abdou Ahmed, Thomas Graf, Thomas Graf, } "Active mirrors for intra-cavity compensation of the aspherical thermal lens in thin-disk lasers", Proc. SPIE 8236, Laser Resonators, Microresonators, and Beam Control XIV, 82360J (6 February 2012); doi: 10.1117/12.905876; https://doi.org/10.1117/12.905876


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