Special Section on Fiber Lasers

Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers

[+] Author Affiliations
Gregory D. Goodno

Northrop Grumman Aerospace Systems, One Space Park, R1–1184D, Redondo Beach, California 90278

Lewis D. Book

Northrop Grumman Aerospace Systems, One Space Park, R1–1184D, Redondo Beach, California 90278

Joshua E. Rothenberg

Northrop Grumman Aerospace Systems, One Space Park, R1–1184D, Redondo Beach, California 90278

Mark E. Weber

Northrop Grumman Aerospace Systems, One Space Park, R1–1184D, Redondo Beach, California 90278

S. Benjamin Weiss

Northrop Grumman Aerospace Systems, One Space Park, R1–1184D, Redondo Beach, California 90278

Opt. Eng. 50(11), 111608 (September 30, 2011). doi:10.1117/1.3631869
History: Received April 18, 2011; Revised July 20, 2011; Accepted August 08, 2011; Published September 30, 2011; Online September 30, 2011
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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.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Gregory D. Goodno ; Lewis D. Book ; Joshua E. Rothenberg ; Mark E. Weber and S. Benjamin Weiss
"Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers", Opt. Eng. 50(11), 111608 (September 30, 2011). ; http://dx.doi.org/10.1117/1.3631869


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