High-power low-smile vertically-stacked laser diode based on microchannel cooling

Hongyou Zhang; Lei Cai; Chung-en Zah; Xingsheng Liu

doi:10.1117/12.2536518

19 November 2019 High-power low-smile vertically-stacked laser diode based on microchannel cooling

Hongyou Zhang, Lei Cai, Chung-en Zah, Xingsheng Liu

Proceedings Volume 11182, Semiconductor Lasers and Applications IX; 111820F (2019) https://doi.org/10.1117/12.2536518
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

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%.

Citation Download Citation

Hongyou Zhang, Lei Cai, Chung-en Zah, and Xingsheng Liu "High-power low-smile vertically-stacked laser diode based on microchannel cooling", Proc. SPIE 11182, Semiconductor Lasers and Applications IX, 111820F (19 November 2019); https://doi.org/10.1117/12.2536518

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