Infrared and Laser Engineering, Volume. 52, Issue 8, 20230254(2023)
SHG efficiency of nonlinear crystal walk-off effect
Figures & Tables(9)
Fig. 1. Pumping of parallel beam: (a) SHG optical path; (b) Internal beam distribution of SHG crystal
Fig. 2. Internal beam distribution of focused beam pumped SHG crystal
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
Fig. 4. The variation of SHG efficiency with pump laser energy. (a) Different
Fig. 5. The variation of SHG efficiency with pump laser energy. (a) Different waist radius; (b) Different divergence angle
Fig. 6. Changes in SHG efficiency and peak power density. (a) Different SHG crystals; (b) Different pump wavelengths of LBO crystal
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
Table 1. Comparison of SHG crystal parameters
View tableView in ArticleTable 1. Comparison of SHG crystal parameters
Frequency-doubling crystal deff/m·V−1 1 064 nm refractive index Walk-off angle/mrad Crystal cutting angle Negative biaxial crystal LBO 0.821 4×10−12 1.626 7.03 θ=90°，φ=11.6° Biaxial crystal KTP 3.58×10−12 1.74 3.16 θ=90°，φ=23.5° Negative uniaxial crystal KDP 0.469×10−12 1.513 11.6 -
Table 2. Comparison of pump and LBO crystal parameters
View tableView in ArticleTable 2. Comparison of pump and LBO crystal parameters
Negative biaxial crystal LBO deff/m·V−1 Refractive index Walk-off angle/mrad Crystal cutting angle Pump of 1 064 nm laser 0.821 4×10−12 1.626 7.03 θ=90°， φ=11.60° Pump of 800 nm laser 0.748 3×10−12 1.632 16.55 θ=90°， φ=31.65° Pump of 600 nm laser 0.424 2×10−12 1.646 16 θ=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
Paper Information
Category: Nonlinear optics
Received: Apr. 26, 2023
Accepted: --
Published Online: Oct. 19, 2023
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