Advances in 976nm single emitter broad area semiconductor diode lasers for 300W+ fiber laser pump module applications

Yihan Xiong; Ching-long Jiang; Ayesha Jamil; Xiaohang Liu; Xi Liu; Prasanta Modak; Stewart McDougall; Konstantin Boucke

doi:10.1117/12.2610381

4 March 2022 Advances in 976nm single emitter broad area semiconductor diode lasers for 300W+ fiber laser pump module applications

Yihan Xiong, Ching-long Jiang, Ayesha Jamil, Xiaohang Liu, Xi Liu, Prasanta Modak, Stewart McDougall, Konstantin Boucke

Author Affiliations +

Proceedings Volume 11983, High-Power Diode Laser Technology XX; 1198305 (2022) https://doi.org/10.1117/12.2610381
Event: SPIE LASE, 2022, San Francisco, California, United States

Abstract

Fiber lasers are becoming dominant in the industrial metal cutting market up to 6kW levels due to their increasing performance delivered at aggressive price levels. A key force behind this is the availability of low-cost diode pump modules, consisting of combined single emitter laser chips. To further develop low pump cost an increase the reliable power available from each chip is required, and in principle this can be achieved by reducing facet power density, current density and lowering operational temperature by widening the emitter and increasing cavity length. Here we present the latest development of high-power laser diode chips at 976 nm wavelength designed for operation in 300W+ per pump module applications. For high power/high brightness applications we show a 150 μm contact opening, 5 mm cavity length chip delivering 20W at 20A CW at BPP of <5.5 mm.mrad. This laser has been deployed in several pump module product configurations from 155 W to 320 W with multi-cell module life test demonstrating over 20,000 hours at 90% survivability. For further power scaling we demonstrate design and performance of single emitter lasers with emitting facets of 220 μm to 300 μm. With 300 μm contact opening and 500 μm single emitter chip width 30W operation power is achieved at 32A with far field divergence less than 12°. Life testing is running at 46A with optical power of 41W for 2000 hours.

Conference Presentation

Citation Download Citation

Yihan Xiong, Ching-long Jiang, Ayesha Jamil, Xiaohang Liu, Xi Liu, Prasanta Modak, Stewart McDougall, and Konstantin Boucke "Advances in 976nm single emitter broad area semiconductor diode lasers for 300W+ fiber laser pump module applications", Proc. SPIE 11983, High-Power Diode Laser Technology XX, 1198305 (4 March 2022); https://doi.org/10.1117/12.2610381

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