新型低损耗石英旋光滤波器

A novel low-loss quartz optical filter

为了提高出射光的透过率,并且在保持主透射峰不变的情况下,增加对次极大强度的减小作用,介绍了一种利用石英晶体旋光作用的新型滤波器,并从原理上作了分析。此新型滤波器与原有多级滤波器相比,主要的改进在于减少了所用偏光镜的数目,以原有3级石英晶体旋光滤波器为例,将此新型滤波器与原有结构进行了比较,从理论上分析了在考虑各器件损耗的情况下的滤波特性。并利用分光光度计对新型石英晶体旋光光学滤波器的滤波特性进行了实验研究。结果表明,此滤波器具有减少出射光损耗的显著效果,同时具有减小次极大的效果。这一结果对观测光谱是有帮助的。

In order to improve the transmission of the output light and reduce the sideband energy with almost the same main intensity, a novel filter based on optical rotatory, dispersion effect was introduced. Starting from its principle, its characteristics were analyzed. Compared with a muhistage quartz crystal filter, the primary improvement of the novel filter was to reduce the number of needed polariseopes. Compared with a three-level quartz etTstal optical filter, the structure and filtering characteristics of the novel filter were analyzed taking different loss into account. The filtering characteristics were measured with a speetrophotometer. The results show that this novel filter can reduce the loss of the output light and the second sideband energy obviously, which is useful for the observation spectrum.