Chemical Vapor Deposition (CVD) diamond film is made by chemical vapor deposition process. It is in transparent after being double-sided polished. The regular diameter can be up to more than 120 mm, and its light transmittance can be up to more than 60% when its thickness is 1 mm (see Fig. 1). As the typical multifunctional material, the diamond provides  high thermal conductivity, high refractive index, radiation resistance, chemical inertness, excellent electrical and mechanical properties, and it is particularly suitable for infrared optical window with 8~12μm long wave.
In all the infrared optical materials, CVD diamond film is the only material combining light transmission, thermal shock resistance and with high durability to the impact of raindrops and solid particles as well as chemical corrosion. More importantly, the extremely low thermal expansion coefficient and high thermal conductivity makes the diamond with excellent ret resistance. It keeps nice optical performance in high temperature environment, making it the best material for infrared optical windows serving in harsh environment.
Application: Window materials for high power laser and detector, protective film for optical lens, radiation detectors and missile radome, etc.