The Development of Wide Cut-off Long-wave Infrared Bandpass Filters

Citation

叶自煌 (Ye Zihuang), 王多书 (Wang Duoshu), 张佰森 (Zhang Baisen), 陈 寿 (Chen Shou), 马 锋 (Ma Feng), 盖志刚 (Gai Zhigang). 宽截止长波红外带通滤光片的研制 [The Development of Wide Cut-off Long-wave Infrared Bandpass Filters]. 真空科学与技术学报 (Journal of Vacuum Science and Technology), 2008, 28(增刊), [Page numbers within the article]

Keywords

  • 宽截止长波红外带通滤光片 / Wide cut-off long-wave infrared bandpass filter
  • 空间用 / For space applications
  • 通带 / Passband
  • 截止带 / Stopband
  • 镀制 / Coating/Fabrication
  • 膜层 / Thin film layer
  • 空间光学遥感系统 / Space optical remote sensing system
  • 红外相机 / Infrared camera
  • 多光谱成像仪 / Multispectral imager
  • 对地成像观测 / Earth imaging observation
  • 光谱分析监测 / Spectral analysis monitoring

Brief

The article discusses the design principles and plasma-assisted deposition fabrication of wide cut-off long-wave infrared bandpass filters for space applications, emphasizing the achievement of high performance and stability using a converging beam infrared optical system for precise monitoring.

Summary

This article focuses on the design and fabrication of high-performance wide cut-off long-wave infrared bandpass filters specifically for space applications. These filters require high average transmittance within the passband and deep rejection in the stopband. To achieve these demanding specifications, the authors discuss the design principles using combinations of long-wave pass and short-wave pass filter layers and the application of a converging beam infrared optical system for precise film thickness monitoring during the coating process. Furthermore, the article emphasizes the use of plasma-assisted deposition technology to improve the microstructure of the film layers and reduce residual stress, leading to enhanced stability and reliability required for space environments.

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