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Proceedings Paper

A novel method of increasing the efficiency of 1064 nm two tone amplifiers through heating of the gain fiber
Author(s): L. J. Henry; T. M. Shay; D. Hult; K. Rowland
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Paper Abstract

The efficiency of two tone fiber amplifiers can be changed rather significantly by altering the temperature of the external environment surrounding the gain fiber. It is shown experimentally that changes in the temperature of the core of the gain fiber has dramatic effects on the 1064 nm / 1040 nm power distribution in the output of narrow linewidth 1064 nm two tone amplifiers with a greater percentage of the output being 1064 nm at higher core temperatures. By increasing the environmental temperature of the gain fiber from 20 to 80°C, the efficiency of a 1064 nm two tone amplifier can be increased up to 40% with the greatest increases seen in amplifiers seeded hardest in 1040 nm, i.e., having the smallest 1064 nm / 1040 nm seed ratios. This has been attributed to temperature dependence of the absorption and emission cross-sections at the wavelengths of interest. Finally, the temperature of the gain fiber can be used as a design tool to enable a higher efficiency 1064 nm two tone amplifier.

Paper Details

Date Published: 10 February 2011
PDF: 8 pages
Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79140A (10 February 2011); doi: 10.1117/12.876148
Show Author Affiliations
L. J. Henry, Air Force Research Lab. (United States)
T. M. Shay, Air Force Research Lab. (United States)
D. Hult, TREX Enterprises Corp. (United States)
K. Rowland, Boeing LTS Inc. (United States)

Published in SPIE Proceedings Vol. 7914:
Fiber Lasers VIII: Technology, Systems, and Applications
Jay W. Dawson, Editor(s)

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