Quasi-CW performance and reliability of dual laser bars on a micro-channel cooler

Hongyou Zhang; Li Chen; Sen Zhao; Boxue Wang; Chung-en Zah; Xingsheng Liu

doi:10.1117/12.2327073

5 November 2018 Quasi-CW performance and reliability of dual laser bars on a micro-channel cooler

Hongyou Zhang, Li Chen, Sen Zhao, Boxue Wang, Chung-en Zah, Xingsheng Liu

Proceedings Volume 10811, High-Power Lasers and Applications IX; 108110F (2018) https://doi.org/10.1117/12.2327073
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

High power density as the critical performance of laser diode pumps significantly affects both efficiency and power of a solid state laser. In this report, we designed a new packaging structure that two laser bars bonded on the top and bottom of a MCC, respectively, to achieve higher power density at the same bias current or the same power density at a reduced bias current with respective to one laser bar on a MCC. We achieve 1KW output power at a lower bias current 450A with 2.3W/A slope efficiency from a dual-bar MCC at a duty cycle of 8% (200 μs/400 Hz). Other performances like spectral width broadening, wavelength shift and reliability about 1KW quasi-CW high power laser diodes and 5KW for one vertical stack with five dual-bar micro-channel coolers (MCCs) also are discussed. The reliability of dual-bar MCC packaging structure is also studied by life-time testing, and the output peak power of all devices degraded less than 5% after working for 1353 hours.

Citation Download Citation

Hongyou Zhang, Li Chen, Sen Zhao, Boxue Wang, Chung-en Zah, and Xingsheng Liu "Quasi-CW performance and reliability of dual laser bars on a micro-channel cooler", Proc. SPIE 10811, High-Power Lasers and Applications IX, 108110F (5 November 2018); https://doi.org/10.1117/12.2327073

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