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Journal of Photonics for Energy

High power and high efficiency 1.8-kW pulsed diode laser bar
Author(s): Manoj Kanskar; Zhigang Chen; Weimin Dong; Xingguo Guan; Shiguo Zhang; Sandrio Elim; Ling Bao; Mike Grimshaw; Mark DeVito
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Paper Abstract

There is a great interest in the development of high-power, high-efficiency, and low-cost quasicontinuous wave (QCW) diode laser bars and arrays for pumping solid state lasers. We report on the development of kW-class 88x-nm diode laser bars that are based on a bipolar cascade design, in which multiple lasers are epitaxially grown in electrical series on a single substrate and separated by low-resistance tunnel junctions with resistance as low as 8.0 × 10 6    Ω - cm 2 . QCW power of 630 W was demonstrated in a 3-mm-wide minibar with 3-mm cavity length. Peak efficiency of 61% was measured with 200    μ s and 14 Hz pulses, at 10°C. Further power scaling was demonstrated in a 1-cm-wide bar with 3-mm cavity length, where a record peak power of 1.8 kW was measured at 1-kA drive current. Ongoing work for further power scaling includes development of triple-junction diode laser bars.

Paper Details

Date Published: 6 March 2017
PDF: 8 pages
J. Photon. Energy 7(1) 016003 doi: 10.1117/1.JPE.7.016003
Published in: Journal of Photonics for Energy Volume 7, Issue 1
Show Author Affiliations
Manoj Kanskar, nLIGHT Corp. (United States)
Zhigang Chen, nLIGHT Corp. (United States)
Weimin Dong, nLIGHT Corp. (United States)
Xingguo Guan, nLIGHT Corp. (United States)
Shiguo Zhang, nLIGHT Corp. (United States)
Sandrio Elim, nLIGHT Corp. (United States)
Ling Bao, nLIGHT Corp. (United States)
Mike Grimshaw, nLIGHT Corp. (United States)
Mark DeVito, nLIGHT Corp. (United States)

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