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

Turn off MathJax

Article Contents

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

Citation:

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

Citation:

PDF( 1389 KB)

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

FullText(HTML)

References(11)

References

[1]	Pratheepan M, Jander D R, Brooks C D, et al. Dual-grating spectral beam combination of high-power fiber lasers[J]. IEEE J Select Top Quantum, 2009, 15(2): 337-343. doi: 10.1109/JSTQE.2008.2012266
[2]	Wirth C, Schmidt O, Tsybin I, et al. High average power spectral beam combining of four fiber amplifiers to 8.2 kW[J]. Opt Lett, 2011, 36(16): 3118-3120. doi: 10.1364/OL.36.003118
[3]	Ma Yi, Yan Hong, Peng Wanjing, et al. 9.6 kW common aperture spectral beam combination system based on multi-channel narrow-linewidth fiber lasers[J]. Chinese Journal of Lasers, 2016, 43: 0901009. doi: 10.3788/CJL201643.0901009
[4]	Chen Xu, Li Chaoming, Chen Xinrong, et al. Design of multilayer film polarization-independent gratings[C]//Proc of SPIE. 2019: 11336OF.
[5]	Tian Fei, Yan Hong, Chen Li, et al. Investigation on the influence of spectral linewidth broadening on the beam quality in spectral beam combination[C]//Proc of SPIE. 2014: 92553N.
[6]	Liu Quan, Jin Yunxia, Wu Jianhong, et al. Fabrication of the polarization independent spectral beam combining grating[C]//Proc of SPIE. 2017: 1025514.
[7]	Shen Biyao, Zeng Lijiang, Li Lifeng, et al. Fabrication of polarization independent gratings made on multilayer dielectric thin film substrates[J]. High Power Laser and Particle Beams, 2015, 27: 111013.
[8]	Chen Junming, Zhang Yibing, Wang Yonglu, et al. Polarization-independent broadband beam combining grating with over 98% measured diffraction efficiency from 1023 to 1080 nm[J]. Optics Letters, 2017, 42(19): 4016-4019. doi: 10.1364/OL.42.004016
[9]	Mao Xinyu, Li Chaoming, Qiu Keqiang, et al. Design and fabrication of 1300-line/mm polarization-independent reflection gratings for spectral beam combining[J]. Opt Commun, 2020, 458: 124883. doi: 10.1016/j.optcom.2019.124883
[10]	James E H, Richard N P. Understanding diffraction grating behavior: including conical diffraction and Rayleigh anomalies from transmission gratings[J]. Opt Eng, 2019, 58: 087105.
[11]	Bayanheshig, Qi Xiangdong, Tang Yuguo, et al. The vector diffraction theory analysis of chromatic dispersion characteristics of phase grating[J]. Acta Physica Sinica, 2003, 52(5): 1157-1161.