Beam combining and SBS suppression in white noise and pseudo-random modulated amplifiers

Brian Anderson; Angel Flores; Roger Holten; Thomas Ehrenreich; Iyad Dajani

doi:10.1117/12.2082713

20 March 2015 Beam combining and SBS suppression in white noise and pseudo-random modulated amplifiers

Brian Anderson, Angel Flores, Roger Holten, Thomas Ehrenreich, Iyad Dajani

Proceedings Volume 9344, Fiber Lasers XII: Technology, Systems, and Applications; 93441U (2015) https://doi.org/10.1117/12.2082713
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

White noise phase modulation (WNS) and pseudo-random binary sequence phase modulation (PRBS) are effective techniques for mitigation of nonlinear effects such as stimulated Brillouin scattering (SBS); thereby paving the way for higher power narrow linewidth fiber amplifiers. However, detailed studies comparing both coherent beam combination and the SBS suppression of these phase modulation schemes have not been reported. In this study an active fiber cutback experiment is performed comparing the enhancement factor of a PRBS and WNS broadened seed as a function of linewidth and fiber length. Furthermore, two WNS and PRBS modulated fiber lasers are coherently combined to measure and compare the fringe visibility and coherence length as a function of optical path length difference. Notably, the discrete frequency comb of PRBS modulation provides a beam combining re-coherence effect where the lasers periodically come back into phase. Significantly, this may reduce path length matching complexity in coherently combined fiber laser systems.

Citation Download Citation

Brian Anderson, Angel Flores, Roger Holten, Thomas Ehrenreich, and Iyad Dajani "Beam combining and SBS suppression in white noise and pseudo-random modulated amplifiers", Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 93441U (20 March 2015); https://doi.org/10.1117/12.2082713

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