6 March 2017 High power and high efficiency 1.8-kW pulsed diode laser bar
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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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Manoj Kanskar, Manoj Kanskar, Zhigang Chen, Zhigang Chen, Weimin Dong, Weimin Dong, Xingguo Guan, Xingguo Guan, Shiguo Zhang, Shiguo Zhang, Sandrio Elim, Sandrio Elim, Ling Bao, Ling Bao, Mike Grimshaw, Mike Grimshaw, Mark DeVito, Mark DeVito, } "High power and high efficiency 1.8-kW pulsed diode laser bar," Journal of Photonics for Energy 7(1), 016003 (6 March 2017). https://doi.org/10.1117/1.JPE.7.016003 . Submission: Received: 11 November 2016; Accepted: 20 February 2017
Received: 11 November 2016; Accepted: 20 February 2017; Published: 6 March 2017

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