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Updated: May 21, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
Published on: February 28, 2016
Build up and decay of mode instability in a high power fiber amplifier
Nicoletta Haarlammert1, Oliver de Vries, Andreas Liem
1Fraunhofer Institute for Applied Optics and Precision Engineering, Albert-Einstein Str. 7, 07745 Jena, Germany. nicoletta.haarlammert@iof.fraunhofer.de
Abstract:
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.
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