Film system structure of ultra-wide-angle laser and long-wave infrared dual-band high-strength antireflection film

Abstract

The invention provides a film system structure of an ultra-wide-angle laser and long-wave infrared dual-band high-strength antireflection film. The film system structure is composed of a zinc sulfidesubstrate and an antireflection film system. The antireflection film system is formed by superposing film layers prepared from four thin film materials, wherein the total number of the film layers is19, and, from the zinc sulfide substrate, the first layer is hafnium oxide, odd layers from the second layer to the eighteenth layer are ytterbium fluoride film layers, even layers are zinc sulfide film layers, and the nineteenth layer is a silicon nitride film layer. According to the invention, high transmission of 1.064 [mu]m laser and 7.5-10.0 [mu]m long-wave infrared rays in an ultra-wide angle range of 0-76 degrees can be realized; the film layers are firm and high strength is achieved; the structure can pass severe environment tests such as wind tunnels, sand dust, raining, salt mist, damp heat, temperature impact and the like in national military standard GJB 150-2009; the structure can meet the application requirements of multi-spectral zinc sulfide optical windows of radar stealthhigh-speed weapon platforms and can be applied to stealth optical windows of multi-band common-optical-path optical systems of stealth airborne and stealth ship-based high-speed weapon platforms.

Description

technical field [0001] The invention belongs to the technical field of optical thin films, and specifically relates to a film system structure of ultra-wide-angle laser and long-wave infrared dual-band high-strength anti-reflection film. Background technique [0002] With the rapid development of modern advanced military optical systems, its operating distance is getting farther and higher, and its accuracy is getting higher and higher. Getting harsher. Especially the optical window of the airborne optoelectronic system, when the aircraft is flying at high speed, the window will be subjected to high-speed impacts such as raindrops, sand, flying insects and even hail. If the surface of the optical window is damaged or damaged, it will affect the operating distance and accuracy of the entire photoelectric system, or even completely paralyze the entire photoelectric system. The multi-spectral zinc sulfide optical window of the radar stealth high-speed weapon platform with inf...

AI Technical Summary

Problems solved by technology

ZnS and YbF3 are commonly used materials in infrared thin film materials, and have low absorption in the working band, but both materials are "soft materials", which cannot withstand the sand, dust, salt spray, humidity, and temperature in the national military standard GJB 150-2009. Impact and other environmental tests; the incident angle range in the patent is much smaller, and the index requirements are relatively low

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