The windows are used to separate the environment on both sides, such as separating the inside and outside of the instrument, so that the inside and outside of the instrument are isolated from each other, thereby protecting the internal devices. The window is the basic optical element, an optical flat plate that does not change the optical magnification and only affects the optical path in the optical path. The important parameters of the window are: light transmittance, surface accuracy, thickness, parallelism, substrate material and other attributes. The window with suitable parameters can be selected according to the specific application. 1T Optics can provide high-precision windows of various materials, such as zinc selenide windows, germanium windows, silicon windows, barium fluoride windows, calcium fluoride windows used in the infrared spectrum; Fused silica windows and sapphire windows in the spectral band; H-K9 windows in the visible light spectrum, etc. We have a large stock of stock standard products, and can also customize optical windows according to specific needs.