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Divided-pulse amplification with fiber-coupled electro-optic modulators

 
: Stark, H.; Müller, M.; Kienel, M.; Klenke, A.; Limpert, J.; Tünnermann, A.

:

Robin, C.A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber Lasers XIV. Technology and Systems : 30 January - 2 February 2017, San Francisco, California, United States
Bellingham, WA: SPIE, 2017 (Proceedings of SPIE 10083)
ISBN: 978-1-5106-0607-4
ISBN: 978-1-5106-0608-1
Paper 1008308
Conference "Fiber Lasers - Technology and Systems" <14, 2017, San Francisco/Calif.>
English
Conference Paper
Fraunhofer IOF ()

Abstract
In this contribution, we present a spatio-temporal coherent beam combining setup in a proof-of-principle experiment with an entirely fiber-coupled front-end. Unlike in previous experiments, where the temporal pulse division was achieved using free-space optical delay lines, the pulses are taken directly from the pulse train of the oscillator. Thereby, the free-space paths and the alignment requirement are cut in half. The combination inevitably remains in free-space considering application in high-power lasers. For the combination of 4 temporally separated pulses, a combining efficiency larger than 95% is demonstrated. The efficiency is largely independent of the combined pulse energy and temporal contrasts close to the theoretically estimated maximum are reached. Potentially, this approach allows for self-optimization of the combination due to the many degrees of freedom accessible with the electro-optic modulators.

: http://publica.fraunhofer.de/documents/N-462058.html