208-W average power and 6.3-mJ pulse energy from four spectrally combined fiber amplified Q-switched nanosecond laser sources using low-cost interference filter

O. Schmidt; C. Wirth; D. Nodop; J. Limpert; A. Tünnermann; T. Schreiber; R. Eberhardt

doi:10.1117/12.840949

17 February 2010 208-W average power and 6.3-mJ pulse energy from four spectrally combined fiber amplified Q-switched nanosecond laser sources using low-cost interference filter

O. Schmidt, C. Wirth, D. Nodop, J. Limpert, A. Tünnermann, T. Schreiber, R. Eberhardt

Author Affiliations +

Proceedings Volume 7580, Fiber Lasers VII: Technology, Systems, and Applications; 75801T (2010) https://doi.org/10.1117/12.840949
Event: SPIE LASE, 2010, San Francisco, California, United States

Abstract

In this contribution we introduce a simple scheme to spectrally combine four single beams using three low-cost dielectric interference filters as combining elements. 25 ns pulses from four independent and actively Q-switched fiber seed-sources are amplified in a single stage fiber-amplifier. Temporally and spatially combined 208 W of average power and 6.3 mJ of pulse energy are obtained out of a fiber-based laser system. A detailed observation of beam quality as well as the thermal behavior of the combining elements have been carried out and reveal mutual dependency. The deterioration of beam quality can be led back to thermal induced wave-front distortions on the part of the interference filters. This effect as well as other influences on M² will be discussed and compared to the competing combining approach with dielectric gratings.

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O. Schmidt, C. Wirth, D. Nodop, J. Limpert, A. Tünnermann, T. Schreiber, and R. Eberhardt "208-W average power and 6.3-mJ pulse energy from four spectrally combined fiber amplified Q-switched nanosecond laser sources using low-cost interference filter", Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 75801T (17 February 2010); https://doi.org/10.1117/12.840949

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