Elliptical window is a plane-parallel plate, it is always used for protecting electronic sensor or detector outside, elliptical window will not change system’s amplification factor. Its basic material includes various optical glass, K9, Uv-fused quartz, infrared fused quartz and crystal material like CaF2, MgF2, ZnSe, Ge and Si, it also provides various optical coating film like antireflection film, high-reflective film, beam splitting film and metal film. Wide antireflection film can be used in ultraviolet band, visible light band, near infrared band and intermediate infrared band.
Elliptical window is parallel optical glass with two surface by grinding and polishing. It is protection between two environment without any influence on visible light. The common coating film has AR and AS. It is mainly applied in digital camera, digital video tape recorder, industrial optical window, product with touch screen, GPS product, window of digital product, car rear view mirror, computer screen, laptop screen and surface of watches.