A novel multipass scheme for enhancement of second harmonic generation.
A novel multipass scheme for enhancement of second harmonic generation.
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DOI：
10.1364/oe.19.022692
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发表时间：
2011-11
期刊：
影响因子：
3.8
通讯作者：
T. Harimoto;Boku Yo;Kosuke Uchida
中科院分区：
文献类型：
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作者：
T. Harimoto;Boku Yo;Kosuke Uchida
我们给出了利用多程非共线位相匹配结构提高调Q纳秒-千赫兹Nd：YVO_4激光器二次谐波的实验证据。与单程结构相比，在I类β-BBO晶体中，双程结构的二次谐波激光的增强因子可达2.5，增加三通可进一步提高倍频激光的增强因子。此外，我们还给出了未转换的基频和二次谐波激光器的相位匹配角与倾斜方位角之间的一般关系。这种多程非共线位相匹配结构能够减少晶体中吸收引起的热效应，有效地避免对晶体表面的破坏。
We present experimental evidence of enhancement of the second-harmonic generation by using a multipass non-collinear phase-matching configuration for a Q-switched nanosecond-kilohertz Nd:YVO4 laser. In comparison with the single-pass configuration, the enhancement factor of the second-harmonic laser with the two-pass configuration is up to 2.5 in a type I beta-barium borate crystal, which can be further increased by adding the third-pass through the crystal. In addition, we provide a general relationship between the phase-matching angle and tilting azimuth angles of the unconverted fundamental and second-harmonic lasers. The multipass non-collinear phase-matching configuration is capable of reducing a thermal effect due to the absorption in the crystal and effectively avoiding damages on the crystal surfaces.