针对内腔拉曼黄光激光器谱线中存在拉曼激光的实际情况,在考虑石英晶体的双折射率色散特性的情况下,将石英晶体和偏光棱镜组合设计成一种用于内腔拉曼黄光激光器590 nm谱线提取的石英晶体双折射滤波器。利用Müller矩阵和斯托克斯参量对双折射滤波器的滤波设计原理进行了分析。以内腔拉曼黄光激光器作为光源,利用AQ-6315A型光谱仪对双折射滤波器的滤波效果进行了测试。实验结果表明,滤波后出射光中已显示不出波长1180 nm激光的存在,从而保证了倍频激光590 nm的纯度。这种双折射滤波器结构简单,操作方便且不改变光的传播方向。

Based on the birefringent index dispersion effect,a quartz crystal birefringent filter is constructed with quartz crystal and polarizer for picking up the 590 nm spectral line in an intracavity Raman yellow laser. The operating principle is analyzed by means of Müller matrix and Stokes parameters. The filtering performance is tested by AQ-6315A spectrometer with an intracavity Raman yellow laser as light source. The experimental results show that the 1180 nm spectral line is extracted after filtering,and the purity of 590 nm frequency laser has been ensured. The structure of this birefringent filter is simple and the operation is convenient. At the same time,it does not change the direction of light beam.