Infrared and Laser Engineering, Volume. 52, Issue 8, 20230254(2023)

SHG efficiency of nonlinear crystal walk-off effect

Feng Gao1,2, Yunpeng Cai1,2, Zhenxu Bai1,2, Yaoyao Qi1,2, Bingzheng Yan1,2, Yulei Wang1,2, Zhiwei Lv1,2, and Jie Ding1,2
Author Affiliations
  • 1Center for Advanced Laser Technology, Hebei University of Technology, Tianjin 300401, China
  • 2Hebei Key Laboratory of Advanced Laser Technology and Equipment, Tianjin 300401, China
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    Figures & Tables(9)
    Pumping of parallel beam: (a) SHG optical path; (b) Internal beam distribution of SHG crystal
    Internal beam distribution of focused beam pumped SHG crystal
    (a) SHG optical path; (b) The SHG efficiency varies with the energy of the pump laser, with or without the walk-off effect; (c) The SHG efficiency of focused and parallel beams varies with the energy of the pump laser
    The variation of SHG efficiency with pump laser energy. (a) Different M2 of fundamental laser; (b) Different focal lengths of focusing lenses; (c) Different radius of fundamental laser
    The variation of SHG efficiency with pump laser energy. (a) Different waist radius; (b) Different divergence angle
    Changes in SHG efficiency and peak power density. (a) Different SHG crystals; (b) Different pump wavelengths of LBO crystal
    (a) The variation of SHG efficiency with pump laser energy for different LBO lengths; (b) The variation of SHG efficiency with crystal length
    • Table 1. Comparison of SHG crystal parameters

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      Table 1. Comparison of SHG crystal parameters

      Frequency-doubling crystaldeff/m·V−11 064 nm refractive indexWalk-off angle/mradCrystal cutting angle
      Negative biaxial crystal LBO0.821 4×10−121.6267.03θ=90°,φ=11.6°
      Biaxial crystal KTP3.58×10−121.743.16θ=90°,φ=23.5°
      Negative uniaxial crystal KDP0.469×10−121.51311.6-
    • Table 2. Comparison of pump and LBO crystal parameters

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      Table 2. Comparison of pump and LBO crystal parameters

      Negative biaxial crystal LBOdeff/m·V−1Refractive indexWalk-off angle/mradCrystal cutting angle
      Pump of 1 064 nm laser0.821 4×10−121.6267.03θ=90°, φ=11.60°
      Pump of 800 nm laser0.748 3×10−121.63216.55θ=90°, φ=31.65°
      Pump of 600 nm laser0.424 2×10−121.64616θ=90°, φ=62.60°
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    Feng Gao, Yunpeng Cai, Zhenxu Bai, Yaoyao Qi, Bingzheng Yan, Yulei Wang, Zhiwei Lv, Jie Ding. SHG efficiency of nonlinear crystal walk-off effect[J]. Infrared and Laser Engineering, 2023, 52(8): 20230254

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    Paper Information

    Category: Nonlinear optics

    Received: Apr. 26, 2023

    Accepted: --

    Published Online: Oct. 19, 2023

    The Author Email:

    DOI:10.3788/IRLA20230254

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