Optical windows are two flat, relatively parallel polished surfaces that allow unaltered light transmission to pass at the working wavelengths of an optical system. Windows are commonly used to separate, encase or shield other components. POSS stocks a large variety of optical windows that are off-the-shelf and readily available or easily customized. Our internal production facility can quickly and affordably modify stock components to meet your projects exact specifications. In addition, we regularly manufacture custom UV, Visible and IR windows in a variety of custom sizes, shapes, and substrates that will meet standard, precision or high precision quality.