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High-power low-smile vertically-stacked laser diode based on microchannel cooling
Author(s): Hongyou Zhang; Lei Cai; Chung-en Zah; Xingsheng Liu
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Paper Abstract

Large smile, the emitters in a laser diode are vertically displaced, is always a big obstacle to affect the directly application of high power laser diode. In this report, a symmetrical structure, that bonding two submounts on the top and bottom of heat sink to control the smile effect by balancing the packaging induced stress, is designed. A cm bar with less than 1 um smile value delivering more than 200W continuous wave (CW) mode output power with power conversion efficiency (PCE) 65% is reported. The lifetime can reach more than 20000 hours. We also report the applications of high power and low smile vertically stacked laser bars, like forming a wider line for glass surface treatment and a rectangular beam for cladding. A 2x14mm2 rectangular beam was built with 32 bars vertical stack to produce 6kW CW mode output power with a beam uniformity of more than 80%.

Paper Details

Date Published: 19 November 2019
PDF: 9 pages
Proc. SPIE 11182, Semiconductor Lasers and Applications IX, 111820F (19 November 2019); doi: 10.1117/12.2536518
Show Author Affiliations
Hongyou Zhang, Xi'an Institute of Optics and Precision Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Focuslight Technologies, Inc. (China)
Lei Cai, Focuslight Technologies, Inc. (China)
Chung-en Zah, Focuslight Technologies, Inc. (China)
Xingsheng Liu, Univ. of Chinese Academy of Sciences (China)
Focuslight Technologies, Inc. (China)


Published in SPIE Proceedings Vol. 11182:
Semiconductor Lasers and Applications IX
Ning Hua Zhu; Werner H. Hofmann; Jian-Jun He, Editor(s)

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