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Proceedings Paper

Higher brightness laser diodes with smaller slow axis divergence
Author(s): Wenyang Sun; Rajiv Pathak; Geoff Campbell; Henry Eppich; J. H. Jacob; Aland Chin; Jack Fryer
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Paper Abstract

The slow axis (SA) divergence of 20% fill-factor, 980nm, laser diodes (LDs) have been investigated under short pulsed (SP) and continuous (CW) operation. By analyzing the data collected under these two modes of operation, one finds that the SA divergence can be separated into two components: an intrinsic divergence and a thermally induced divergence. At low injected current and power, the intrinsic SA divergence is dominant while at high power their magnitudes are approximately equal. The thermal gradient across the broad stripe is negligible under SP operation and, the SA divergence increased at a much slower rate as a function of injected current, thereby increasing the brightness of the LD by 2X. SRL has redesigned microchannel coolers that remove the thermal gradient under CW operation thereby eliminating the thermally induced SA divergence resulting in LDs that are 2X brighter at 300W/bar.

Paper Details

Date Published: 26 February 2013
PDF: 9 pages
Proc. SPIE 8605, High-Power Diode Laser Technology and Applications XI, 86050D (26 February 2013); doi: 10.1117/12.2004308
Show Author Affiliations
Wenyang Sun, Science Research Lab., Inc. (United States)
Rajiv Pathak, Coherent, Inc. (United States)
Geoff Campbell, Science Research Lab., Inc. (United States)
Henry Eppich, Science Research Lab., Inc. (United States)
J. H. Jacob, Science Research Lab., Inc. (United States)
Aland Chin, Somerville Laser Technology, LLC (United States)
Jack Fryer, Micro Cooling Concepts, Inc. (United States)


Published in SPIE Proceedings Vol. 8605:
High-Power Diode Laser Technology and Applications XI
Mark S. Zediker, Editor(s)

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