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Proceedings Article

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

[+] Author Affiliations
Joshua E. Rothenberg, Peter A. Thielen, Michael Wickham, Charles P. Asman

Northrop Grumman Space Technology

Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 68730O (February 22, 2008); doi:10.1117/12.774714
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From Conference Volume 6873

  • Fiber Lasers V: Technology, Systems, and Applications
  • Jes Broeng; Clifford Headley III
  • San Jose, CA | January 19, 2008

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.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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 (February 22, 2008); doi:10.1117/12.774714; http://dx.doi.org/10.1117/12.774714


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