A ZNS substrate film structure that reflects 0.5-0.8 μm visible light and 1.064 μm laser light and transmits 3.7-4.8 μm mid-wave infrared dichroic film

Abstract

The present invention provides a film system structure of ZnS substrate with inverse 0.5-0.8[Mu]m visible light, laser with 1.064[Mu]m and transparent medium wave infrared colour separation with 3.7-4.8[Mu]m. The film system structure comprises a ZnS substrate and a color separation film system, and the color separation film system is made of three film materials; the number of the film layers is 51, wherein the first layer and the 51th layer are oxidation zirconium film layer, the even layers from the second layer to the 50th layer are ytterbium fluoride film layers and the odd layers from the second layer to the 50th layer are zinc sulfide film layers. The transmittance is smaller than 2% with the waveband from 0.5 to 0.8 [Mu]m; the transmittance is smaller than 1% with the laser waveband of 1.064 [Mu]m; and the transmittance is larger than 95% with the medium wave infrared band from 3.7 to 4.8 [Mu]m. The film system structure is small in the number of layers, small in thickness, low in plating difficulty, good in technology repeatability, high in obtained film firmness and good in spectral property, is able to satisfy the use requirement of multi-waveband co-window optoelectronic system and the work requirement in the condition of the inclination with 45 degrees, and stand against the environment tests such as high and low temperature storage, temperature impact and the like, the adhesion test and the moderate friction test.

Description

technical field [0001] The invention belongs to the technical field of optical thin films, and specifically relates to a ZnS substrate that reflects 0.5-0.8 μm visible light and 1.064 μm laser light and transmits 3.7-4.8 μm mid-wave infrared dichroic film, which is used for airborne, ship-borne, and vehicle-mounted In the optical system of the multi-band common optical path of the optoelectronic platform. Background technique [0002] The current optoelectronic system platform is constantly developing towards the direction of small size, mobility, multi-functional integration, and all-weather use. Multi-band co-window technology is more and more widely used in optoelectronic system platforms. Sensing systems all combine multiple sensors in a single package, including visible and mid-wave infrared cameras, forward-looking infrared (FLIR), and laser range finders. These combined systems are all observed through a common aperture window, so as to achieve the purpose of miniatu...

AI Technical Summary

Problems solved by technology

In the paper, the film system has different spectral bands, and the zinc selenide material is used for design, and the absorption loss in the visible band is relatively large

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