Suppression of stimulated Brillouin scattering in single-frequency multi-kilowatt fiber amplifiers

Joshua E. Rothenberg; Peter A. Thielen; Michael Wickham; Charles P. Asman

doi:10.1117/12.774714

22 February 2008 Suppression of stimulated Brillouin scattering in single-frequency multi-kilowatt fiber amplifiers

Joshua E. Rothenberg, Peter A. Thielen, Michael Wickham, Charles P. Asman

Proceedings Volume 6873, Fiber Lasers V: Technology, Systems, and Applications; 68730O (2008) https://doi.org/10.1117/12.774714
Event: Lasers and Applications in Science and Engineering, 2008, San Jose, California, United States

Abstract

Previous research has shown that temperature gradients along a fiber can broaden the Stimulated Brillouin Scattering (SBS) gain profile and thereby increase the SBS threshold. However, within practical temperature ranges this method has been limited to SBS thresholds of a few hundred Watts. It is also well known that strain gradients applied to a fiber can broaden the SBS resonance. To suppress the SBS threshold to kW levels in fiber amplifiers of length ~5 m requires broadening of the SBS resonance width to ~1 GHz, which can be achieved with a strain of 1 - 2%. Although tensile strain is generally limited by fiber failure to less than ~1%, compressive strain has been employed to the level of many percent in a number of applications in the tuning of fiber Bragg gratings. We demonstrate the effect of SBS gain broadening and suppression by strain gradients at high power (~ 190 W) for the first time to our knowledge, and explore scaling of this method to kW output levels.

Citation Download Citation

Joshua E. Rothenberg, Peter A. Thielen, Michael Wickham, and Charles P. Asman "Suppression of stimulated Brillouin scattering in single-frequency multi-kilowatt fiber amplifiers", Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 68730O (22 February 2008); https://doi.org/10.1117/12.774714

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