• Infrared and Laser Engineering
  • Vol. 52, Issue 8, 20230254 (2023)
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|Show fewer author(s)
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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    DOI: 10.3788/IRLA20230254 Cite this Article
    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 Copy Citation Text show less
    Pumping of parallel beam: (a) SHG optical path; (b) Internal beam distribution of SHG crystal
    Fig. 1. Pumping of parallel beam: (a) SHG optical path; (b) Internal beam distribution of SHG crystal
    Internal beam distribution of focused beam pumped SHG crystal
    Fig. 2. 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
    Fig. 3. (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
    Fig. 4. 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
    Fig. 5. 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
    Fig. 6. 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
    Fig. 7. (a) The variation of SHG efficiency with pump laser energy for different LBO lengths; (b) The variation of SHG efficiency with crystal length
    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 1. Comparison of SHG 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°
    Table 2. Comparison of pump and LBO crystal parameters
    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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