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Explanation of stimulated Raman scattering in high power fiber systems

: Bock, V.; Liem, A.; Schreiber, T.; Eberhardt, R.; Tünnermann, A.


Hartl, I. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber Lasers XV: Technology and Systems 2018 : 29 January - 1 February 2018, San Francisco, California
Bellingham, WA: SPIE, 2018 (Proceedings of SPIE 10512)
ISBN: 978-1-5106-1509-0
ISBN: 978-1-5106-1510-6
Paper 105121F, 7 S.
Conference "Fiber Lasers - Technology and Systems <15, 2018, San Francisco/Calif.>
Fraunhofer IOF ()

We present investigations on the seed source dependence of stimulated Raman scattering (SRS) created in a high power fiber amplifier. It is shown that fiber oscillators are much worse in terms of SRS than other seed sources. The longitudinal mode composition was found to be of less importance. We reinforce the experimental observations by a numerical investigation, which shows that temporal power variations on the ps-scale and their propagation along the fiber are crucial for the SRS creation in high-power fiber systems, extending the well-known but simplified SRS threshold description.