Opt Express. 2023 Feb 27;31(5):8494-8502. doi: 10.1364/OE.478600.
High beam quality 588 nm radiation was realized based on a frequency-doubled crystalline Raman laser. The bonding crystal of YVO/Nd:YVO/YVO was used as the laser gain medium, which can accelerate the thermal diffusion. The intracavity Raman conversion and the second harmonic generation were realized by a YVO crystal and an LBO crystal, respectively. Under an incident pump power of 49.2 W and a pulse repetition frequency of 50 kHz, the 588 nm power of 2.85 W was obtained with a pulse duration of 3 ns, corresponding to a diode-to-yellow laser conversion efficiency of 5.75% and a slope efficiency of 7.6%. Meanwhile, a single pulse's pulse energy and peak power were 57 µJ and 19 kW, respectively. The severe thermal effects of the self-Raman structure were overcome in the V-shaped cavity, which has excellent mode matching, and combined with the self-cleaning effect of `Raman scattering, the beam quality factor M was effectively improved, which was measured optimally to be M = 1.207, and M = 1.200, with the incident pump power being 49.2 W.
基于倍频晶体拉曼激光器实现了高光束质量的 588nm 辐射。YVO/Nd:YVO/YVO 键合晶体用作激光增益介质，可加速热扩散。腔内拉曼转换和二次谐波产生分别通过 YVO 晶体和 LBO 晶体实现。在 49.2W 的入射泵浦功率和 50kHz 的脉冲重复频率下，获得了 2.85W 的 588nm 功率，脉冲持续时间为 3ns，对应于 5.75%的二极管-黄激光转换效率和 7.6%的斜率效率。同时，单脉冲的脉冲能量和峰值功率分别为 57µJ 和 19kW。V 型腔克服了自拉曼结构的严重热效应，具有优良的模式匹配，并结合拉曼散射的自清洁效应，有效地提高了光束质量因子 M，在入射泵浦功率为 49.2W 时，最佳测量值为 M=1.207 和 M=1.200。
