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Proceedings Paper

Stimulated Brillouin scattering suppression with a chirped laser seed: comparison of dynamical model to experimental data
Author(s): Eliot Petersen; Zhi Yang; Jeffrey O. White; George Rakuljic; Naresh Satyan; Arseny Vasilyev; Amnon Yariv
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Paper Abstract

When scaling CW single-mode fiber amplifiers to high power, the first nonlinear limitation that appears for narrowlinewidth seed lasers is stimulated Brillouin scattering (SBS). We present a dynamical simulation of Brillouin scattering in a Yb-doped fiber amplifier that numerically solves the differential equations in z and t describing the laser, Stokes and pump waves, the inversion, and the density fluctuations that seed the scattering process. We compare the model to experimental data, and show that a linearly chirped seed laser is an efficient form of SBS suppression; especially for long delivery fibers. The frequency chirp decreases the interaction length by chirping through the Brillouin resonance in a time that is short compared to the fiber transit time. The seed has a highly linear chirp of 1014 – 1016 Hz/s at 1064 nm which preserves a well-defined phase relationship in time. This method of SBS suppression retains a long effective coherence length for purposes of coherent combining, while at high chirps appears to the SBS as a large linewidth, increasing the threshold. An increase in fiber length increases the laser bandwidth as seen by the SBS, leading to a fiberlength- independent SBS threshold.

Paper Details

Date Published: 17 March 2014
PDF: 8 pages
Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 89613H (17 March 2014); doi: 10.1117/12.2037750
Show Author Affiliations
Eliot Petersen, U.S. Army Research Lab. (United States)
Zhi Yang, U.S. Army Research Lab. (United States)
Jeffrey O. White, U.S. Army Research Lab. (United States)
George Rakuljic, Telaris, Inc. (United States)
Naresh Satyan, California Institute of Technology (United States)
Arseny Vasilyev, California Institute of Technology (United States)
Amnon Yariv, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 8961:
Fiber Lasers XI: Technology, Systems, and Applications
Siddharth Ramachandran, Editor(s)

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