研究了多谐波固体激光器在气体中的受激拉曼散射,获得了多波长激光输出。利用Nd∶YAG激光的二倍频、三倍频及四倍频的激光输出在氢气和甲烷气体中的受激拉曼特性获得多个波长的拉曼输出,波长范围覆盖紫外到可见光甚至近红外。列出了常用的几种拉曼工作气体,其中氢气和甲烷各有优缺点,而两者的混合气体一方面弥补了氢气频移过大的缺点,另一方面抑制了甲烷的易分解性。利用缓冲气体和混合气体优化拉曼激光的输出。给出了24个拉曼波长的功率输出数据,其中功率较大的有13个波长。多谐波固体激光与受激拉曼散射结合的多波长拉曼激光器在激光雷达等领域有广泛的应用。

In this paper, a combinative technology of harmonic solid-state laser and stimulated Raman scattering (SRS) has been investigated to obtain multi-wavelength laser output with definite power. Multi-order harmonics of a Nd∶YAG laser, second harmonic (SH), thrird harmonic (TH) and fourth harmonic (FH) have been employed to generate multiple Raman lines by pumping the gases of hydrogen, methane, etc. The output Raman lines cover waveband from ultraviolet to near infrared. The characteristics of frequently used Raman gases, methane and hydrogen have been discussed, both have advantages and disadvantages. The mixture gas of these two gases makes up the overlarge frequency shift of hydrogen on the one hand, and restrains the decomposition of methane on the other hand. The rare buffer gases and the mixture gas have also been employed to optimize the Raman output. The table of 24 Raman lines is listed in this paper, including 13 lines of rather strong power. Multi-wavelength Raman lasers integrating the technologies of SRS and harmonic solid-state lasers could be applied in lidar and other application field.