Noncollinear matched broadband third-harmonic generation based on angular dispersion
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摘要: 宽带光打靶可以有效降低激光等离子体相互作用过程中非线性效应。提出一种基于角色散的非共线匹配宽带三倍频方案，利用宽带基频与窄带二倍频的非共线和频产生宽带三倍频，和频过程中通过特殊设计的渐变光栅实现不同频率的基频光束以特定角度入射，补偿了波长差异引入的位相失配使得全波段满足位相匹配条件。理论模拟表明，采用KDP晶体Ⅱ类位相匹配，将中心波长为1058 nm、带宽10 nm的宽带基频光与526.5 nm的二倍频光进行非共线匹配和频，可以实现高效宽带三倍频转换。Abstract: Broadband laser can effectively reduce the nonlinear effect in the process of laser plasma interaction. This paper proposes a noncollinear matching broadband third-harmonic generation based on angular dispersion, which uses the noncollinear sum frequency of the broadband fundamental wave and the narrowband second harmonic to generate broadband third harmonic, and the sum frequency process is realized by a specially designed gradient grating. The fundamental laser beams of different frequencies are incident at a specific angle, which compensates for the phase mismatch caused by the wavelength difference, so that the whole waveband meets the match condition of phase. Theoretical simulation shows that using KDP crystal type II phase matching, high efficiency broadband third-harmonic generation can be achieved by combining the broad-band fundamental wave (center wavelength 1058 nm, bandwidth 10 nm) and the second harmonic (526.5 nm).
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Key words:
- third-harmonic generation /
- broadband laser /
- noncollinear matching /
- high power laser
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图 1 基于角色散非共线匹配的宽带三倍频光路方案示意图
Figure 1. Schematic of broadband third-harmonic generation with angularly dispersed noncollinear matching
图 2 非共线匹配示意图和基于角色散非共线匹配示意图
Figure 2. Schematic of noncollinear phase matching and angularly dispersed noncollinear matching
图 5 渐变光栅G3刻线密度的随其长度（x）的变化关系
Figure 5. Distribution of gradient grating G3 line density with location (x)
图 6 无光栅、使用常规光栅及渐变光栅G3补偿的情况下，不同频率成分对应的谐波转换效率及转换效率随晶体长度的分布曲线
Figure 6. Efficiency of different frequency without grating, with ordinary
图 7 转换效率随基频光强度的分布曲线
Figure 7. Efficiency changes with crystal length of different schemes grating and grating G3
图 8 光束口径对谐波转换效率图像
Figure 8. Influence of beam aperture on harmonic conversion efficiency
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