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Build up and decay of mode instability in a high power fiber amplifier

: Haarlammert, Nicoletta; Vries, Oliver de; Liem, Andreas; Kliner, Andrea; Peschel, Thomas; Schreiber, Thomas; Eberhardt, Ramona; Tünnermann, Andreas

Postprint (1.5 MByte; PDF; )

Optics Express 20 (2012), No.12, pp.13274-13283
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IOF ()
fiber optics and optical communications; fiber optics amplifiers and oscillators; fiber optics and optical communications; fiber properties lasers and laser optics; thermal effect

State-of-the-art high power Yb-doped large mode area fibers have been developed to a performance level able to reach the so-called mode instability threshold. In this contribution we will discuss the experimental results regarding the temporal evolution (build up and decay) of this effect to come closer to a comprehensive understanding of its driving mechanisms. Our investigations prove that the relevant time scale for build up and decay of mode instability is in the millisecond range and thus deliver experimental evidence of underlying thermal effects. To the best of our knowledge these are the first systematic, time resolved investigations on that topic.