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众所周知,镀制红外(波长长于6～8微米)高反射镜,是利用介质膜或金属膜来实现的。对于这段光谱区域来说,由于低折射率膜料的吸收,要制得介质高反射膜(R≈99%)是困难的;此外,厚度为20～25微米的膜层,机械强度照例是不高的。利用金属膜来实现高反射镜是比较容易的。但是,需要保护铜膜和银膜镀层免受大气的侵蚀,否则,2～3月以后,就不合用了。本文描述了这一问题的解决方法。主要的困难在于保护层材料的选择。为了这个目的,在红外光谱区是透明的硫化物、硒化物,由于它们可能与金属反应,都是不合适的。而氧化物和氟化物在红外光谱区域(2～
As we all know, coated infrared (wavelength longer than 6 to 8 microns) high reflector is the use of dielectric film or metal film to achieve. For this spectral region, it is difficult to produce a dielectric high-reflection film (R≈99%) due to the absorption of the low-refractive index film. In addition, the film thickness of 20 to 25 μm is, as an example, Not high. The use of metal film to achieve high reflectance is relatively easy. However, the need to protect the copper film and silver coating from the atmosphere of erosion, otherwise, 2 to 3 months later, do not work together. This article describes the solution to this problem. The main difficulty lies in the choice of protective material. For this purpose, sulfides, selenides, which are transparent in the infrared region of the spectrum, are not suitable due to their possible reaction with the metal. The oxide and fluoride in the infrared spectral region (2 ~