Influence of signal bandwidth on mode instability thresholds of fiber amplifiers

Jesse J. Smith; Arlee V. Smith

doi:10.1117/12.2077021

4 March 2015 Influence of signal bandwidth on mode instability thresholds of fiber amplifiers

Jesse J. Smith, Arlee V. Smith

Proceedings Volume 9344, Fiber Lasers XII: Technology, Systems, and Applications; 93440L (2015) https://doi.org/10.1117/12.2077021
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

We show how signal bandwidth affects the gain of stimulated thermal Rayleigh scattering (STRS) which is responsible for a transverse mode instability in fiber amplifiers. The gain is reduced if the coherence time of the signal is less than the group-velocity-induced walk off between the two interacting modes, usually LP₀₁ and LP₁₁. We derive expressions for the bandwidth required to suppress gain for short pulses, for periodically chirped continuous waves, and for general periodically modulated cases.

Citation Download Citation

Jesse J. Smith and Arlee V. Smith "Influence of signal bandwidth on mode instability thresholds of fiber amplifiers", Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 93440L (4 March 2015); https://doi.org/10.1117/12.2077021

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