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Proceedings Paper

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

Paper Details

Date Published: 20 March 2015
PDF: 9 pages
Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 93441U (20 March 2015); doi: 10.1117/12.2082713
Show Author Affiliations
Brian Anderson, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Angel Flores, Air Force Research Lab. (United States)
Roger Holten, Air Force Research Lab. (United States)
Thomas Ehrenreich, Air Force Research Lab. (United States)
Iyad Dajani, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 9344:
Fiber Lasers XII: Technology, Systems, and Applications
L. Brandon Shaw, Editor(s)

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