Optical elements, because of the reflection of the surface of the elements so that the loss of light energy, in order to reduce the reflection of the surface of the elements, often in the optical element coating transparent media film, this film is called anti-reflection film. The role of anti-reflection film is to reduce the intensity of reflected light, thereby increasing the intensity of transmitted light, so that the optical system imaging more clearly. The commonly used anti-reflection film materials include magnesium fluoride, titanium oxide, lead sulfide, lead selenide, ceramic intrared anti-reflection film, vinyl sesquioxane hybrid fim, etc. Generally speaking, coating includes single-layer magnesium fluoride anti-rellection film, multi-layer anti-
reflection film, broadband antl-rellection film, dual-wavelength antl-reflection film and 80 on. We can also design according to customer requirements.