Abstract The output characteristics of orange-yellow-green emission switchable output generated in a compact passively Q-switched YVO4 Raman laser were investigated for the first time. A Cr4+:YAG/YAG composite crystal was adopted as the saturable absorber to realize passively Q-switch operation. The diode-end-pumped Nd:YAP laser operating at 1.08 μm was used to drive an a-cut YVO4 crystal for realizing the first-Stokes wavelength at 1.2 μm. Selective frequency mixing of the first-Stokes and the fundamental waves in a shared cavity were achieved by an angle-tuned BBO crystal. Under an incident pump power of 12.05 W, the average maximum output powers of 472 mW for 597.4 nm orange light, 431 mW for 567.2 nm yellow light and 803 mW for 539.9 nm green light could be switchable output with respective pulse widths of about 2.6, 2.4 and 37.6 ns. Under the maximum incident pump power, the pulse repetition frequency and the single pulse energy were approximately 11.6, 10.9, 13.4 kHz and 40.7, 39.5, 59.9 μJ, respectively.

中文翻译：

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被动调Q多可见波长可切换YVO4拉曼激光器

摘要 首次研究了紧凑型被动调Q YVO4拉曼激光器产生的橙黄绿发射可切换输出的输出特性。采用 Cr4+:YAG/YAG 复合晶体作为可饱和吸收体，实现被动 Q 开关操作。工作在 1.08 μm 的二极管端泵浦 Nd:YAP 激光器用于驱动 a-cut YVO4 晶体，以实现 1.2 μm 的第一斯托克斯波长。第一斯托克斯和基波在共享腔中的选择性混频是通过角度调谐的 BBO 晶体实现的。在 12.05 W 的入射泵浦功率下，597.4 nm 橙色光的平均最大输出功率为 472 mW，567.2 nm 黄色光的平均最大输出功率为 431 mW，539.9 nm 绿色光的平均最大输出功率为 803 mW，可切换输出，各自的脉冲宽度约为 2.6， 2.4 和 37.6 纳秒。