Volume Bragg Grating for Coupling the Stokes Wave Out of an Amplifier

Report No. ARL-TN-0409
Authors: John E. McElhenny, Jeffrey O. White, Steven D. Rogers, and Tigran Sanamyan
Date/Pages: September 2010; 16 pages
Abstract: High power multimode fiber (MMF) master-oscillator power amplifiers (MOPAs) with stimulated Brillouin scattering (SBS) beam cleanup and wavefront reversal are under development at the U.S. Army Research Laboratory (ARL) to counter rockets, artillery, and mortar (CRAM). When Faraday isolators are used for outcoupling the Stokes light in the MMF MOPAs, the power scalability is limited. Volume Bragg gratings (VBGs) appear to be more scalable. We report here the results of tests on a VBG designed to separate wavelengths 0.0604 nm (16 GHz) apart, corresponding to the SBS frequency shift at 1064 nm in fused silica.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2010