对全固化激光器输出激光的强度噪声谱进行了理论分析与实验测定,设计了由三镜环行腔构成的模清洁器,利用它过滤高频噪声的特性使单频Nd:YVO4激光器的强度噪声降低,通过模清洁器之前激光在30MHz才能达到散粒噪声极限,通过模清洁器之后在7MHz处便达到散粒噪声基准。设计中兼顾了窄线宽与透过效率两方面要求,模清洁器的透过效率为70%。

The mode-cleanerconsisting of a ring cavity with three mirrors was designed based on the theoreticalanalyses and experimental measurements to the intensity noise spectra of anall-solid-state laser. The intensity noise of a homemade single-frequency Nd:YVO4 laser has beensignificantly decreased by using the mode-cleaner with the characteristic of filteringhigh frequency noise. The noise frequency to reach the shot-noise-limit has been reducedto 7 MHz from 30 MHz without the mode-cleaner. In design, the requirements of both narrowbandwidth and higher transitivity for the cavity were considered compatibly. Thetransitivity of mode-cleaner is 70%.