19 February 2018 Improvement in reduced-mode (REM) diodes enable 315 W from 105-μm 0.15-NA fiber-coupled modules
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Proceedings Volume 10514, High-Power Diode Laser Technology XVI; 105140L (2018) https://doi.org/10.1117/12.2289146
Event: SPIE LASE, 2018, San Francisco, California, United States
Abstract
High-power, high-brightness diode lasers have been pursued for many applications including fiber laser pumping, materials processing, solid-state laser pumping, and consumer electronics manufacturing. In particular, ~915 nm – and ~976 nm diodes are of interest as diode pumps for the kilowatt CW fiber lasers. As a result, there have been many technical thrusts for driving the diode lasers to have both high power and high brightness to achieve high-performance and reduced manufacturing costs. This paper presents our continued progress in the development of high brightness fiber-coupled product platform, nLIGHT element®. In the past decade, the power coupled into a single 105 μm and 0.15 NA fiber has increased by over a factor of ten through improved diode laser brightness and the development of techniques for efficiently coupling multiple emitters. In this paper, we demonstrate further brightness improvement and power-scaling enabled by both the rise in chip brightness/power and the increase in number of chips coupled into a given numerical aperture. We report a new chip technology using x-REM design with brightness as high as 4.3 W/mm-mrad at a BPP of 3 mm-mrad. We also report record 315 W output from a 2×12 nLIGHT element with 105 μm diameter fiber using x-REM diodes and these diodes will allow next generation of fiber-coupled product capable of 250W output power from 105 μm/0.15 NA beam at 915 nm.
Conference Presentation
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M. Kanskar, L. Bao, Z. Chen, D. Dawson, M. DeVito, W. Dong, M. Grimshaw, X. Guan, M. Hemenway, R. Martinsen, W. Urbanek, S. Zhang, "Improvement in reduced-mode (REM) diodes enable 315 W from 105-μm 0.15-NA fiber-coupled modules", Proc. SPIE 10514, High-Power Diode Laser Technology XVI, 105140L (19 February 2018); doi: 10.1117/12.2289146; https://doi.org/10.1117/12.2289146
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