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Proceedings Paper

Multi-kilowatt power scaling and coherent beam combining of narrow-linewidth fiber lasers
Author(s): Iyad Dajani; Angel Flores; Roger Holten; Brian Anderson; Benjamin Pulford; Thomas Ehrenreich
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Paper Abstract

We report results from two ~1.5 kW Yb-doped fiber amplifiers with comparable optical to optical efficiencies and linewidths. One amplifier utilized a fiber with a core diameter of 25 μm while the core diameter of the fiber utilized in the other amplifier was 20 μm. Stimulated Brillouin scattering (SBS) suppression in both cases was achieved through pseudo-random bit sequence (PRBS) phase modulation. While the power generated in the larger core fiber was modal instability (MI) limited, no sign of MI was observed in the smaller core fiber. This may allow us to utilize the higher MI threshold fiber to scale further while maintaining sufficiently narrow linewidth for beam combining. Furthermore, in a demonstration of the utility of applying a thermal gradient in conjunction with phase modulation to suppress SBS further, we report on a 1 kW amplifier driven at a PRBS clock rate of 2 GHz. Finally, we compare the coherent beam combining properties of amplifiers seeded with PRBS phase modulated sources to those seeded with white noise sources.

Paper Details

Date Published: 9 March 2016
PDF: 8 pages
Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 972801 (9 March 2016); doi: 10.1117/12.2218216
Show Author Affiliations
Iyad Dajani, Air Force Research Lab. (United States)
Angel Flores, Air Force Research Lab. (United States)
Roger Holten, Air Force Research Lab. (United States)
Brian Anderson, Air Force Research Lab. (United States)
Benjamin Pulford, Air Force Research Lab. (United States)
Thomas Ehrenreich, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 9728:
Fiber Lasers XIII: Technology, Systems, and Applications
John Ballato, Editor(s)

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