6 March 2017 High power and high efficiency 1.8-kW pulsed diode laser bar
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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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Manoj Kanskar, Zhigang Chen, Weimin Dong, Xingguo Guan, Shiguo Zhang, Sandrio Elim, Ling Bao, Mike Grimshaw, 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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