Spectral interval compressing structure in spectral beam combination system for diode laser arrays

Beilun Qin; Yu Xiao; Xiahui Tang; Hao Peng; Wenlong Yang; Zikang Chen

doi:10.1117/1.OE.58.6.066112

20 June 2019 Spectral interval compressing structure in spectral beam combination system for diode laser arrays

Beilun Qin, Yu Xiao, Xiahui Tang, Hao Peng, Wenlong Yang, Zikang Chen

Author Affiliations +

Funded by: National Key R&D Program of China, National Natural Science Foundation of China (NSFC)

Optical Engineering, Vol. 58, Issue 6, 066112 (June 2019). https://doi.org/10.1117/1.OE.58.6.066112

Abstract

An efficient spectral beam combining (SBC) system for diode lasers with compressed spectral interval is proposed and demonstrated experimentally. This structure consists of a transmission grating and a reflector paralleled to the grating, which can make the beam diffracted twice by only one transmission grating. The advantage of this configuration is that it compresses the spectral interval of the output beam into half compared to the traditional single-grating setup and improves the utilization rate of the grating element compared to the previous double grating system. The experimental results demonstrate that the spectral intervals of a 3-emitter diode laser array (DLA) and a 5-emitter DLA with traditional single-grating structure are 4.36 and 4.69 nm, respectively. In the modified system, the spectral intervals of the same DLA with 3 and 5 emitters are 2.15 and 2.35 nm, respectively, which shows that this method can compress the spectrum interval effectively and will be promising for a practical SBC system.

Citation Download Citation

Beilun Qin, Yu Xiao, Xiahui Tang, Hao Peng, Wenlong Yang, and Zikang Chen "Spectral interval compressing structure in spectral beam combination system for diode laser arrays," Optical Engineering 58(6), 066112 (20 June 2019). https://doi.org/10.1117/1.OE.58.6.066112

Received: 22 March 2019; Accepted: 29 May 2019; Published: 20 June 2019

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