Numerical Simulation in Deep‐Ultraviolet Tunable Laser Based on Cascaded Frequency Doubling in <bold>β</bold>‐BBO Crystals

Yifan Zhang; Zeliang Zhang; Pengfei Qi; Lu Sun; Nan Zhang; Lie Lin; Weiwei Liu

doi:10.3788/CJL240643

Chinese Journal of Lasers, Volume. 51, Issue 18, 1801004(2024)

Numerical Simulation in Deep‐Ultraviolet Tunable Laser Based on Cascaded Frequency Doubling in β‐BBO Crystals

Yifan Zhang¹, Zeliang Zhang¹, Pengfei Qi^1,2, Lu Sun^1,2, Nan Zhang^1,2, Lie Lin^1,3、*, and Weiwei Liu^1,2

Author Affiliations

¹Institute of Modern Optics, Eye Institute, Nankai University, Tianjin 300350, China

²Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Tianjin 300350, China

³Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network, Tianjin 300350, China

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Figures & Tables(10)

Fig. 1. Schematic of fourth harmonic cascade system

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Fig. 2. Phase matching angle of harmonic. (a) Third harmonic (b) fourth harmonic

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Fig. 3. Relationship between temperature and harmonic transmittance at 193.4 nm

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Fig. 4. Effect of temperature on phase matching of β-BBO crystals. (a) Minimum wavelength of fourth harmonic phase-matching at different temperatures; (b) phase matching angle of fourth harmonic at different temperatures

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Fig. 5. Fourth harmonic conversion efficiencies under different crystal thicknesses. (a) Second and third harmonic crystal thicknesses; (b) fourth harmonic crystal thickness

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Fig. 6. Time delay of each harmonic

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Fig. 7. Harmonic conversion efficiencies under different fundamental wave powers

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Fig. 8. Fourth harmonic powers under different fundamental frequency powers

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Table 1. Parameters of cascade system

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Table 1. Parameters of cascade system

Parameter	Value
Wavelength range of Ti∶sapphire laser	650‒1050 nm
Power of Ti∶sapphire laser	3.5 W
Repetition rate of Ti∶sapphire laser	80 MHz
Pulse width of Ti∶sapphire laser	150 ps
Cutting angle of SHG β-BBO	θ=29.1°， φ=0°
Cutting angle of THG β-BBO	θ=44.3°， φ=0°
Cutting angle of FHG β-BBO	θ=64.8°， φ=0°

Table 2. Time delay of fundamental light with respect to each harmonic in crystal
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Table 2. Time delay of fundamental light with respect to each harmonic in crystal
Wavelength /nm Crystal length /mm Group velocity /（10⁸ m·s^-1） Time delay /ps
800 ‒ 1.7809 ‒
400 8.8 1.7217 1.70
266 12.1 1.5725 9.00

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Yifan Zhang, Zeliang Zhang, Pengfei Qi, Lu Sun, Nan Zhang, Lie Lin, Weiwei Liu. Numerical Simulation in Deep‐Ultraviolet Tunable Laser Based on Cascaded Frequency Doubling in β‐BBO Crystals[J]. Chinese Journal of Lasers, 2024, 51(18): 1801004

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