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Proceedings Paper

Using a linearly chirped seed suppresses SBS in high-power fiber amplifiers, allows coherent combination, and enables long delivery fibers
Author(s): Jeffrey O. White; Eliot Petersen; J. Edgecumbe; George Rakuljic; Naresh Satyan; Arseny Vasilyev; A. Yariv
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Paper Abstract

When seeding a high power fiber amplifier with a frequency-chirped seed, the backward Brillouin scattering can be kept at the spontaneous level because the coherent laser/Stokes interaction is interrupted. Operating a conventional vertical cavity surface-emitting diode laser in an optoelectronic feedback loop can yield a linear frequency chirp of ~1016 Hz/s at a constant output power. The simple and deterministic variation of phase with time preserves temporal coherence, in the sense that it is straightforward to coherently combine multiple amplifiers despite a large length mismatch. The seed bandwidth as seen by the counter-propagating SBS is large, and also increases linearly with fiber length, resulting in a nearly-length-independent SBS threshold. Experimental results at the 600W level will be presented. The impact of a chirped seed on multimode instability is also addressed theoretically.

Paper Details

Date Published: 11 March 2014
PDF: 7 pages
Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 896102 (11 March 2014); doi: 10.1117/12.2042919
Show Author Affiliations
Jeffrey O. White, U.S. Army Research Lab. (United States)
Eliot Petersen, U.S. Army Research Lab. (United States)
J. Edgecumbe, Nufern (United States)
George Rakuljic, Telaris, Inc. (United States)
Naresh Satyan, Telaris, Inc. (United States)
Arseny Vasilyev, California Institute of Technology (United States)
A. 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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