Long & Short Wave Pass Filters are used to separate wavelength regions of light or heat. UV rejection with visible transmission, visible rejection with IR transmission, and visible transmission with NIR rejection are filter designs that is deposited on either glass or plastic substrates. It provides excellent temperature stability, steep transition slope, high rejection and transmission. Every phase of the process is performed in-house, including thin-film coating design, mechanical design, substrate fabrication and polishing, coating, inspection, and environmental testing. It is also used as stray light or trim filters, to eliminate any unwanted near band radiation.