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Polarization-independent isolation of high power laser radiation

: Daniels, M.; Nicklaus, K.; Hoffmann, H.-D.; Altmeyer, S.

Beyer, E. ; Wissenschaftliche Gesellschaft Lasertechnik -WLT-:
Lasers in manufacturing 2005 : Proceedings of the Third International WLT-Conference Lasers in Manufacturing, LIM 2005; Munich, Germany, June 13th - 16th, 2005
Stuttgart: AT-Fachverlag, 2005
ISBN: 3-00-016402-2
International Conference on Lasers in Manufacturing <3, 2005, München>
Fraunhofer ILT ()

Solid-state lasers in manufacturing are susceptible for backreflections disturbing the standing-wave oscillation in the laser cavity. These backreflections may cause the laser to become unstable and completely unusable in some applications. Due to thermal effects caused by absorption of laser radiation in magneto-optic media, optical isolators for multi-kW average power are not available yet. A design of a fiber-coupled, polarization-independent optical isolator for kW average power is introduced. Experimental data of Nd:YAG-laser radiation of up to 1 kW average power transmitted through the isolator will be presented.