为了提高临近空间激光通信的信噪比，避免杂散光的干扰，通常采用滤光片对信号进行过滤和采集。针对通信系统滤光片的参数要求，选择合适的薄膜材料，结合制备工艺，对膜系进行设计。采用电子束加热蒸发和离子辅助沉积技术镀制薄膜。采用与膜系评价函数和膜层敏感度相关的数学模型，优化出膜层敏感度较低的膜系，制备的滤光片满足临近空间激光通信链路光学系统的使用要求，并通过了环境测试。

In order to improve the signal-to-noise ratio of the near space laser communication and avoid interference from stray light, we often use filters to filter and collect the signal. According to the parameter requirements of filters in the communication system, we select appropriate film materials with the preparation technology to design the film system. Electron beam heating evaporation and ion-assisted deposition system are adopted for film preparation. Using the film system′s evaluation function and the mathematical model related to the film sensitivity, the sensitivity of the film is optimized. The filters meet the requirements of the use of near space laser communication link optical system, and pass the environmental testing.