High power and high efficiency kW 88x-nm multi-junction pulsed diode laser bars and arrays

Zhigang Chen; John Bai; Weimin Dong; Xingguo Guan; Shiguo Zhang; Sandrio Elim; Ling Bao; Mike Grimshaw; Mark Devito; Manoj Kanskar

doi:10.1117/12.2041125

12 March 2014 High power and high efficiency kW 88x-nm multi-junction pulsed diode laser bars and arrays

Zhigang Chen, John Bai, Weimin Dong, Xingguo Guan, Shiguo Zhang, Sandrio Elim, Ling Bao, Mike Grimshaw, Mark Devito, Manoj Kanskar

Author Affiliations +

Proceedings Volume 8965, High-Power Diode Laser Technology and Applications XII; 896514 (2014) https://doi.org/10.1117/12.2041125
Event: SPIE LASE, 2014, San Francisco, California, United States

Abstract

There is great interest in the development of high-power, high-efficiency and low cost QCW 88x-nm diode laser bars and arrays for pumping solid state lasers. We report on the development of kW 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. Multiple laser junctions, each of which is based on nLight’s high performance 88x-nm epitaxial design, are separated by low resistance tunnel junctions with resistance as low as 8.0x10^-6Ω-cm². Optimization of bar geometry and wafer fabrication processes was explored for electrical and optical performance improvement in double-junction diode lasers. A QCW power of 630 W was demonstrated in a 3-mm wide mini-bar with 3-mm cavity length. Peak efficiency of 61% was measured with 200 s and 14 Hz pulses, at a heatsink temperature of 10 °C. Further power scaling was demonstrated in a 1-cm wide bar with 3-mm cavity length, where a record high peak power of 1.77 kW was measured at 1 kA drive current. Ongoing work for further power scaling includes development of triple-junction diode laser bars and double-junction bar-stack that emits < 10kW optical power.

Citation Download Citation

Zhigang Chen, John Bai, Weimin Dong, Xingguo Guan, Shiguo Zhang, Sandrio Elim, Ling Bao, Mike Grimshaw, Mark Devito, and Manoj Kanskar "High power and high efficiency kW 88x-nm multi-junction pulsed diode laser bars and arrays", Proc. SPIE 8965, High-Power Diode Laser Technology and Applications XII, 896514 (12 March 2014); https://doi.org/10.1117/12.2041125

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available