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Proceedings Paper

High-power diode lasers operating around 1500-nm for eyesafe applications
Author(s): Steve Patterson; Paul Leisher; Kirk Price; Keith Kennedy; Weimin Dong; Mike Grimshaw; Shiguo Zhang; Jason Patterson; Suhit Das; Scott Karlsen; Rob Martinsen; Jake Bell
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Paper Abstract

Er:YAG solid state lasers offer an "eye-safe" alternative to traditional Nd:YAG lasers for use in military and industrial applications such as range-finding, illumination, flash/scanning LADAR, and materials processing. These laser systems are largely based on diode pumped solid state lasers that are subsequently (and inefficiently) frequency-converted using optical parametric oscillators. Direct diode pumping of Er:YAG around 1.5 μm offers the potential for greatly increased system efficiency, reduced system complexity/cost, and further power scalability. Such applications have been driving the development of high-power diode lasers around these wavelengths. For end-pumped rod and fiber applications requiring high brightness, nLIGHT has developed a flexible package format, based on scalable arrays of single-emitter diode lasers and efficiently coupled into a 400 μm core fiber. In this format, a rated power of 25 W is reported for modules operating at 1.47 μm, with a peak electrical to optical conversion efficiency of 38%. In centimeter-bar on copper micro-channel cooler format, maximum continuous wave power in excess of 100 W at room temperature and conversion efficiency of 50% at 6C are reported. Copper heat sink conductively-cooled bars show a peak electrical-to-optical efficiency of 43% with 40 W of maximum continuous wave output power. Also reviewed are recent reliability results at 1907-nm.

Paper Details

Date Published: 14 April 2008
PDF: 7 pages
Proc. SPIE 6952, Laser Source Technology for Defense and Security IV, 69520W (14 April 2008); doi: 10.1117/12.795157
Show Author Affiliations
Steve Patterson, nLight Corp. (United States)
Paul Leisher, nLight Corp. (United States)
Kirk Price, nLight Corp. (United States)
Keith Kennedy, nLight Corp. (United States)
Weimin Dong, nLight Corp. (United States)
Mike Grimshaw, nLight Corp. (United States)
Shiguo Zhang, nLight Corp. (United States)
Jason Patterson, nLight Corp. (United States)
Suhit Das, nLight Corp. (United States)
Scott Karlsen, nLight Corp. (United States)
Rob Martinsen, nLight Corp. (United States)
Jake Bell, nLight Corp. (United States)

Published in SPIE Proceedings Vol. 6952:
Laser Source Technology for Defense and Security IV
Mark Dubinskii; Gary L. Wood, Editor(s)

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