Long-wave Filter (II) 20～100 Micron Long-wave Filter

Citation

盛勇 (Sheng Yong) (译) [translated by], 京涌 (Jing Yong) (校) [proofread by]. 长波滤光片(二)20～100微米长波滤光片 [Long-wave Filter (II) 20～100 Micron Long-wave Filter]. [Source of Publication Unknown], [Year of Publication Unknown], [Page Numbers as indicated in the excerpts].

Keywords

  • 长波滤光片 / Long-wave filter
  • 窄带滤光片 / Narrow bandpass filter
  • 低通滤光片 / Low-pass filter
  • 多层膜 / Multilayer film
  • 基片 / Substrate
  • 薄膜 / Thin film
  • 高真空 / High vacuum
  • 剩余射线吸收 / Reststrahlen absorption
  • 组合滤光片 / Combination filter
  • 吸收带 / Absorption band
  • 多层膜系统 / Multilayer film system
  • 增透膜层 / Anti-reflection coating
  • 截止区 / Stop band
  • 半宽 / Bandwidth
  • 截止波长 / Cutoff wavelength

Brief

This article explores the fabrication and performance of various narrow bandpass and low-pass long-wave infrared filters in the 1 micron and 20-100 micron ranges, discussing substrate and thin film materials, deposition methods, and challenges encountered in achieving desired optical and mechanical properties.

Summary

This article discusses the fabrication of long-wave infrared filters in the 1 and 20-100 micron ranges, including both narrow bandpass and low-pass filters. It explores various substrate materials like germanium, silicon, and crystalline quartz, and thin film materials such as germanium, zinc sulfide, and cadmium telluride. The article highlights the challenges in depositing stable multilayer films due to factors like material property mismatches and internal stress. Different filter designs, deposition techniques (high vacuum evaporation), and performance characteristics (transmittance, bandwidth) are examined, with a focus on overcoming issues like shortwave transmission suppression, substrate limitations (e.g., absorption, birefringence), and achieving desired spectral responses. The use of anti-reflection coatings and protective layers is also mentioned.

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