Research on 940nm kilowatt high efficiency quasi-continuous diode laser bars

Yuliang Zhao; Zhenfu Wang; Guowen Yang; Te Li; Yunfei Song; Luhan Qi; Gang Wang; Yuxian Liu; Bo Li; Shaobo Bai

doi:10.1117/12.2534034

17 May 2019 Research on 940nm kilowatt high efficiency quasi-continuous diode laser bars

Yuliang Zhao, Zhenfu Wang, Guowen Yang, Te Li, Yunfei Song, Luhan Qi, Gang Wang, Yuxian Liu, Bo Li, Shaobo Bai

Proceedings Volume 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019); 1117040 (2019) https://doi.org/10.1117/12.2534034
Event: Fourteenth National Conference on Laser Technology and Optoelectronics, 2019, Shanghai, China

Abstract

High-power GaAs-based semiconductor lasers are the most efficient source of energy for converting electrical into optical power. 940nm diode lasers are used directly or as pump sources for Yb:YAG solid-state lasers, and are widely used in laser cladding and other fields. Improving electro-optic conversion efficiency and reliable output power are urgent requirements for current research hotspots and industrial laser systems. In this paper, we use an asymmetric epitaxial structure of InGaAs/AlGaAs, which reduces the optical loss and resistance, and adopt better cavity surface technology to present 940nm 1-cm quasi-continuous micro-channel cooling (MCC) laser bars. The lasers are tested under a high duty cycle of 9.6% (600us,160Hz) at 25°C with output power of 660.05W, electro-optic conversion efficiency of 64.71% at 600A and slope efficiency of 1.16 W/A. The peak efficiency reaches 72.4%. The increased efficiency results from a lower threshold current and a lower series resistance. Furthermore, the output power of 1025W (1000A) has been confirmed at a duty cycle of 4% (400us,100Hz).

Citation Download Citation

Yuliang Zhao, Zhenfu Wang, Guowen Yang, Te Li, Yunfei Song, Luhan Qi, Gang Wang, Yuxian Liu, Bo Li, and Shaobo Bai "Research on 940nm kilowatt high efficiency quasi-continuous diode laser bars", Proc. SPIE 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019), 1117040 (17 May 2019); https://doi.org/10.1117/12.2534034

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