Lasers and Laser Optics

Cryogenic ceramic 277 watt Yb:YAG thin-disk laser

[+] Author Affiliations
Natasa Vretenar

University of New Mexico, Center for High Technology Materials, 1313 Goddard SEAlbuquerque, New Mexico 87106

Tim C. Newell, Tyler Carson, William P. Latham

Air Force Research Laboratory Directed Energy Directorate, 3550 Aberdeen Avenue SEKirtland Air Force Base, New Mexico 87117

Phillip Peterson, Tim Lucas

Boeing LTS Inc., P.O. Box 5670 MC RN-M1Kirtland Air Force Base, New Mexico 87117

Huseyin Bostanci, Jennifer J. Huddle-Lindauer, Benjamin A. Saarloos, Dan Rini

RINI Technologies, 582 South Econ CircleOviedo, Florida 32765

Opt. Eng. 51(1), 014201 (Feb 09, 2012). doi:10.1117/1.OE.51.1.014201
History: Received August 24, 2011; Revised November 1, 2011; Accepted November 2, 2011
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Abstract.  A ceramic ytterbium:yttrium aluminum garnet (Yb:YAG) thin-disk laser is investigated at 15°C (288 K) and also at 80 K, where it behaves as a four-level laser. We introduce a new two-phase spray cooling method to cool the Yb:YAG. One system relies on R134a refrigerant while the other uses liquid nitrogen (LN2). The use of two systems allows the same disk to be tested at the two temperatures. When the Yb:YAG is cooled from room to cryogenic temperatures, the lasing threshold drops from 155 W to near 10 W, while the slope efficiency increases from 54% to a 63%. A 277 W laser with 520 W of pump is demonstrated. We also model the thermal and structural properties at these two temperatures and estimate the beam quality.

Figures in this Article
© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Natasa Vretenar ; Tim C. Newell ; Tyler Carson ; Phillip Peterson ; Tim Lucas, et al.
"Cryogenic ceramic 277 watt Yb:YAG thin-disk laser", Opt. Eng. 51(1), 014201 (Feb 09, 2012). ; http://dx.doi.org/10.1117/1.OE.51.1.014201


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