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Optical Engineering

Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers
Author(s): Gregory D. Goodno; Lewis D. Book; Joshua E. Rothenberg; Mark E. Weber; Stanley B. Weiss
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Paper Abstract

Thulium-doped fiber lasers (TFLs) emitting retina-safe 2-μm wavelengths offer substantial power-scaling advantages over ytterbium-doped fiber lasers for narrow linewidth, single-mode operation. This article reviews the design and performance of a pump-limited, 600 W, single-mode, single-frequency TFL amplifier chain that balances thermal limitations against those arising from stimulated Brillouin scattering (SBS). A simple analysis of thermal and SBS limits is anchored with measurements on kilowatt class Tm and Yb fiber lasers to highlight the scaling advantage of Tm for narrow linewidth operation. We also report recent results on active phase-locking of a TFL amplifier to an optical reference as a precursor to further parallel scaling via coherent beam combining.

Paper Details

Date Published: 1 November 2011
PDF: 11 pages
Opt. Eng. 50(11) 111608 doi: 10.1117/1.3631869
Published in: Optical Engineering Volume 50, Issue 11
Show Author Affiliations
Gregory D. Goodno, Northrop Grumman Aerospace Systems (United States)
Lewis D. Book, Northrop Grumman Aerospace Systems (United States)
Joshua E. Rothenberg, Northrop Grumman Aerospace Systems (United States)
Mark E. Weber, Northrop Grumman Aerospace Systems (United States)
Stanley B. Weiss, Northrop Grumman Aerospace Systems (United States)

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