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Optical Engineering

Cryogenic ceramic 277 watt Yb:YAG thin-disk laser
Author(s): Natasa Vretenar; Tim C. Newell; Tyler Carson; William P. Latham; Phillip R. Peterson; Tim Lucas; Huseyin Bostanci; Jennifer J. Huddle-Lindauer; Benjamin A. Saarloos; Daniel P. Rini
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Paper 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.

Paper Details

Date Published: 9 February 2012
PDF: 7 pages
Opt. Eng. 51(1) 014201 doi: 10.1117/1.OE.51.1.014201
Published in: Optical Engineering Volume 51, Issue 1
Show Author Affiliations
Natasa Vretenar, The Univ. of New Mexico (United States)
Tim C. Newell, Air Force Research Lab. (United States)
Tyler Carson, Air Force Research Lab. (United States)
William P. Latham, Air Force Research Lab. (United States)
Phillip R. Peterson, Boeing LST Inc. (United States)
Tim Lucas, Boeing LST Inc. (United States)
Huseyin Bostanci, Rini Technologies, Inc. (United States)
Jennifer J. Huddle-Lindauer, Rini Technologies, Inc. (United States)
Benjamin A. Saarloos, Rini Technologies, Inc. (United States)
Daniel P. Rini, Rini Technologies, Inc. (United States)

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