碲化铅/硫化锌红外多层滤光片的光谱漂移研究

采用碲化铅和硫化锌作为镀膜材料，研制了空间红外光学系统使用的红外多层带通滤光片。本文首次利用导纳轨迹图解技术，当在空间低温条件下使用时，对由碲化铅的折射率变化引起的光谱漂移机理进行了研究。根据多层膜各膜层间存在的光学厚度的补偿效应，建立了光谱漂移模型。并对设计的滤光片采用对分法计算了它在低温条件下波长的漂移量，计算结果与研制出的滤光片实测结果吻合很好。并成功地将研究结果应用于滤光片的设计，对原设计结果进行了准确的修正，使得最终研制的滤光片在低温下完全满足使用要求。

Study on spectral shift of PbTe/ZnS infrared multilayer filters

A multilayer band pass infrared thin film optical filter has been designed and manufactured which use lead telluride and zinc sulfide as thin film materials. Study on the spectral shift of the filter due to the change of index of lead telluride when used under the condition of low temperature has been made in this paper. A shift model has been established for the first time on the basis of interlayer compensating effect of multilayer thin films, and the shift range of wavelength has been calculated using equal dividing method, the result was coincide with the measured result.