Realizing high efficiency spectral beam combining with dual-gratings based on conical diffraction

Wu Juan; Li Jianmin; Yin Xinqi; Zeng Lijiang; Qiu Keqiang; Li Chaoming; Yan Hong

doi:10.11884/HPLPB202032.200192

Volume 32 Issue 12

Nov. 2020

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Article Navigation > High Power Laser and Particle Beams > 2020 > 32(12): 121006

Wu Juan, Li Jianmin, Yin Xinqi, et al. Realizing high efficiency spectral beam combining with dual-gratings based on conical diffraction[J]. High Power Laser and Particle Beams, 2020, 32: 121006. doi: 10.11884/HPLPB202032.200192

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Wu Juan, Li Jianmin, Yin Xinqi, et al. Realizing high efficiency spectral beam combining with dual-gratings based on conical diffraction[J]. High Power Laser and Particle Beams, 2020, 32: 121006. doi: 10.11884/HPLPB202032.200192

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Realizing high efficiency spectral beam combining with dual-gratings based on conical diffraction

doi: 10.11884/HPLPB202032.200192

1.
Institute of Applied Electronics, CAEP, Mianyang, China
2.
Department of Precision Instrument, State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China
3.
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
4.
School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215006, China

Received Date: 2020-07-08
Rev Recd Date: 2020-11-02
Publish Date: 2020-11-19

Abstract

Abstract

The feasibility of realizing high efficiency spectral beam combining with multilayer dielectric (MLD) gratings based on conical diffraction was analyzed. The spectral beam combining approach was designed with the incident polar angle nearly equals to the Littrow angle based on the conical diffraction theory and two unit beams were experimentally combined. The experimental results indicate that, the diffraction efficiency nearly did not change in the case of conical diffraction when θ was constant and $\varphi$ ＝6°. The combining efficiency of the output beam which was composited by two unit beams (wavelength equals to 1050.24 nm and 1064.33 nm respectively) with incident polar angle θ of 43.99° was 92.9%, 8.8% higher than that of approach based on non-conical diffraction. The beam quality factor after combining were M_x²＝1.204 and M_y²＝1.467, which were almost equivalent to that of approach based on non-conical diffraction.
- conical diffraction,
- non-conical diffraction,
- dual-MLD gratings,
- spectral beam combining,
- combining efficiency

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References(11)

References

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