High Power Multimode Fiber Master Oscillator Power Amplifier (MOPA) with Stimulated Brillouin Scattering (SBS) Beam Cleanup and Phase Conjugation

Report No. ARL-MR-0796
Authors: John E. McElhenny, Jeffrey O. White, and Steven D. Rogers
Date/Pages: September 2011; 20 pages
Abstract: This is a study, at the 102 W power level, of the feasibility of using stimulated Brillouin scattering (SBS) beam cleanup and wavefront reversal to obtain 105 W of single-mode output from a multi-mode fiber amplifier. These techniques allow power scaling by circumventing the problem of maintaining single-mode operation in a fiber with a large core. We have achieved 51-W peak power (34 W average) out of the beam cleanup fiber master oscillator power amplifier (MOPA) system. We also demonstrated the use of a volume Bragg grating to outcouple the Stokes beam in such a system.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2011