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Multipass configuration to achieve high-frequency conversion in Li_2B_4O_7 crystals

机译：多通道配置可在Li_2B_4O_7晶体中实现高频转换

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摘要

A multipass configuration for second-harmonic generation of Nd:YAG laser radiation is demonstrated to produce, for the first time to the authors' knowledge in twin lithium tetraborate crystals, as much as 21% conversion efficiency even though the effective nonlinear coefficient of the crystal is as low as 1/6th that of KDP. Apart from crystals that have large walk-off angles, low effective nonlinear coefficients, or both, the simple experimental setup would also be quite suitable for those crystals, especially infrared crystals, that have large effective nonlinear coefficients but low laser damage thresholds.
机译：首次证明作者对双硼酸锂四硼酸盐晶体产生二次谐波生成Nd：YAG激光辐射的多程配置，即使该晶体的有效非线性系数高达21％。仅为KDP的1/6。除了具有大的偏离角，低的有效非线性系数或两者兼有的晶体外，简单的实验设置也非常适合那些具有较大的有效非线性系数但激光损伤阈值较低的晶体，尤其是红外晶体。

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