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Proceedings Paper

Room temperature high power mid-IR diode laser bars for atmospheric sensing applications
Author(s): Paul Crump; Steve Patterson; Weimin Dong; Mike Grimshaw; Jun Wang; Shiguo Zhang; Sandrio Elim; Mike Bougher; Jason Patterson; Suhit Das; Damian Wise; Triston Matson; David Balsley; Jake Bell; Mark DeVito; Rob Martinsen
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Paper Abstract

Peak CW optical power from single 1-cm diode laser bars is advancing rapidly across all commercial wavelengths and the available range of emission wavelengths also continues to increase. Both high efficiency ~ 50% and > 100-W power InP-based CW bars have been available in bar format around 1500-nm for some time, as required for eye-safe illuminators and for pumping Er-YAG crystals. There is increasing demand for sources at longer wavelengths. Specifically, 1900-nm sources can be used to pump Holmium doped YAG crystals, to produce 2100-nm emission. Emission near 2100-nm is attractive for free-space communications and range-finding applications as the atmosphere has little absorption at this wavelength. Diode lasers that emit at 2100-nm could eliminate the need for the use of a solid-state laser system, at significant cost savings. 2100-nm sources can also be used as pump sources for Thulium doped solid-state crystals to reach even longer wavelengths. In addition, there are several promising medical applications including dental applications such as bone ablation and medical procedures such as opthamology. These long wavelength sources are also key components in infra-red-counter-measure systems. We have extended our high performance 1500-nm material to longer wavelengths through optimization of design and epitaxial growth conditions and report peak CW output powers from single 1-cm diode laser bars of 37W at 1910-nm and 25W at 2070-nm. 1-cm bars with 20% fill factor were tested under step-stress conditions up to 110-A per bar without failure, confirming reasonable robustness of this technology. Stacks of such bars deliver high powers in a collimated beam suitable for pump applications. We demonstrate the natural spectral width of ~ 18nm of these laser bars can be reduced to < 3-nm with use of an external Volume Bragg Grating, as required for pump applications. We review the developments required to reach these powers, latest advances and prospects for longer wavelength, higher power and higher efficiency.

Paper Details

Date Published: 10 May 2007
PDF: 11 pages
Proc. SPIE 6552, Laser Source Technology for Defense and Security III, 655216 (10 May 2007); doi: 10.1117/12.721592
Show Author Affiliations
Paul Crump, nLight Corp. (United States)
Steve Patterson, nLight Corp. (United States)
Weimin Dong, nLight Corp. (United States)
Mike Grimshaw, nLight Corp. (United States)
Jun Wang, nLight Corp. (United States)
Shiguo Zhang, nLight Corp. (United States)
Sandrio Elim, nLight Corp. (United States)
Mike Bougher, nLight Corp. (United States)
Jason Patterson, nLight Corp. (United States)
Suhit Das, nLight Corp. (United States)
Damian Wise, nLight Corp. (United States)
Triston Matson, nLight Corp. (United States)
David Balsley, nLight Corp. (United States)
Jake Bell, nLight Corp. (United States)
Mark DeVito, nLight Corp. (United States)
Rob Martinsen, nLight Corp. (United States)

Published in SPIE Proceedings Vol. 6552:
Laser Source Technology for Defense and Security III
Gary L. Wood; Mark A. Dubinskii, Editor(s)

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