Stimulated Brillouin Scattering Suppression in Fiber Amplifiers via Chirped Diode Lasers

Report No. ARL-TN-0451
Authors: Jeffrey O. White, George Rakuljic, and Carl E. Mungan
Date/Pages: September 2011; 18 pages
Abstract: We propose to simultaneously suppress stimulated Brillouin scattering (SBS) and enable coherent combination by seeding fiber amplifiers with a linearly-chirped diode laser. The seed spectrum will appear broadband to suppress the SBS, but the well-defined chirp will have sufficient coherence to allow the active phasing of multiple amplifiers. The phasing can be accomplished without strict optical path-length matching by interfering each amplifier's output with a reference, processing the resulting signal with a phase-locked loop, and using the error signal to drive an acousto-optic frequency shifter at the frontend of each fiber amplifier.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2011