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Deep-UV 236.5 nm laser by fourth-harmonic generation of a single-crystal fiber Nd:YAG oscillator

机译:通过单谐波光纤Nd:YAG振荡器的第四谐波产生的深紫外236.5 nm激光器

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摘要

We demonstrate a deep-UV laser at 236.5 nm based on extracavity fourth-harmonic generation of a Q-switched Nd: YAG single-crystal fiber laser at 946 nm. We first compare two nonlinear crystals available for second-harmonic generation: LBO and BiBO. The best results at 473 nm are obtained with a BiBO crystal, with an average output power of 3.4 W at 20 kHz, corresponding to a second-harmonic generation efficiency of 38%. This blue laser is frequency-converted to 236.5 nm in a BBO crystal with an overall fourth-harmonic generation yield of 6.5%, corresponding to an average output power of 600 mW at 20 kHz. This represents an order of magnitude increase in average power and energy compared to previously reported pulsed lasers at 236.5 nm. This work opens the possibility of LIDAR detection of dangerous compounds for military or civilian applications.
机译:我们基于946 nm的Q开关Nd:YAG单晶光纤激光器的腔外四谐波产生,展示了236.5 nm处的深紫外激光器。我们首先比较可用于二次谐波生成的两种非线性晶体:LBO和BiBO。使用BiBO晶体在473 nm处可获得最佳结果,在20 kHz时的平均输出功率为3.4 W,对应于38%的二次谐波产生效率。该蓝色激光在BBO晶体中被频率转换为236.5 nm,总的第四谐波产生率为6.5%,对应于20 kHz时的平均输出功率为600 mW。与先前报道的在236.5 nm处的脉冲激光器相比,这表示平均功率和能量增加了一个数量级。这项工作为激光雷达探测军事或民用危险化合物提供了可能性。

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