Research on 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 [Research on Wide Cut-off Long-Wave Infrared Bandpass Filters]. 真空科学与技术学报 (Journal of Vacuum Science and Technology), [Symbol for Volume] 增刊 [Supplement], 刃年 [Year Symbol] 月 [Month Symbol].

Keywords

  • 长波红外带通滤光片 / Long-wave infrared bandpass filter
  • 宽截止 / Wide cut-off
  • 空间 / Space applications
  • 通带 / Passband
  • 平均透射率 / Average transmittance
  • 截止带 / Cut-off band / Rejection band
  • 截止深度 / Cut-off depth
  • 波纹系数 / Ripple coefficient
  • 光学系统 / Optical system
  • 设计原则 / Design principles
  • 设计方法 / Design methods
  • 解析法 / Analytical method
  • 自动优化法 / Automatic optimization method
  • 膜层 / Film layer
  • 镀制 / Coating / Fabrication)
  • 会聚光红外光学系统 / Converging beam infrared optical system
  • 等离子体辅助沉积工艺 / Plasma-assisted deposition

Brief

This article focuses on the design principles and fabrication methods of wide cut-off long-wave infrared bandpass filters specifically for space applications, highlighting the importance of high average transmittance, deep cut-off depth, and stability achieved through techniques like plasma-assisted deposition and a converging beam infrared optical system.

Summary

This article discusses the design and fabrication of high-performance wide cut-off long-wave infrared bandpass filters for space applications. Key challenges include achieving high transmittance in the passband, deep cut-off in the rejection band, and good environmental stability. The researchers explored design methods using combinations of long-wave pass and short-wave pass filters, employing a converging beam infrared optical system for precise film thickness monitoring and plasma-assisted deposition to improve film quality and reduce stress.

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