Optical windows are made of optically transparent materials with parallel polished sides, ground edges and chamfers. The only difference between windows and filters is degree of attenuation of the optical spectrum.
The optical windows are usually intended to have maximum possible transmission for given material. The AR coatings are often applied on the polished sides of the optical windows to improve their transmission characteristics. Windows are often used as protective elements. However, they may have additional filter or beamsplitter function. We can produce custom windows on request.
