为了测定粉末材料的倍频特性, 根据Kurtz-Perry粉末倍频效应理论, 采用光参量振荡技术, 获取了130mJ@1064nm和20mJ@1570nm的双波长调Q激光输出, 并进行了理论分析和实验验证。实现了粉末样品的1064nm和1570nm双波长倍频测试, 解决了单一波长测试时晶体粉末材料对倍频信号波长的吸收而导致难以测得倍频信号的问题, 有效非线性系数测试灵敏度达到0.46pm/V。结果表明, KTP粉末样品倍频信号变化趋势与理论相吻合, 该系统对晶体的非线性检测运行稳定可靠, 测试简单方便快捷。

In order to measure the frequency doubling characteristics of powder materials, according to the theory of Kurtz-Perry powder frequency doubling effect and the theory of optical parametric oscillation, dual wavelength Q-switched laser output of 130mJ@1064nm and 20mJ@1570nm was obtained. After theoretical analysis and experimental verification, the 1064nm and 1570nm dual wavelength frequency doubling test of powder sample was realized. The problem, that the absorption of crystal powder material to the wavelength of frequency doubling signal makes it difficult to measure the frequency doubling signal when testing the single wavelength, was solved. The results show that the test sensitivity of effective nonlinear coefficient reaches 0.46pm/V. the variation trend of frequency doubling signal of KTP powder samples is consistent with the theory. The system is stable, simple, convenient and reliable for nonlinear detection of crystals.