Diamond infrared window

The more commonly used infrared window materials are ZnS and ZnSe. Although these two materials have good infrared transmittance, their physical properties are relatively fragile and easily damaged. In military and non-conventional applications, the requirements for infrared windows are very strict. These devices often work under very harsh conditions. For example, the infrared window used for missiles not only runs at a high speed after the missile is launched, but also withstands the test of wind, sand, rain, and snow. Diamond film is a high-quality surface material. Diamond has infrared antireflection characteristics. At the same time, diamond film is a good anti-reflection film material for infrared windows. In addition, the high thermal conductivity and wear resistance of diamond can also protect the infrared window from external impact. Therefore, plating a diamond film on the surface of the infrared window completely solves various problems in the application of infrared windows in the military and aerospace field.

Lockheed Missile and Space Company of the United States has used low-pressure gas phase synthesis of diamond film to manufacture the window of large pneumatic weapon missile interceptor. The double-sided diamond film is plated on the silicon chip, which can increase the light transmittance by 26%, and the window can withstand harshness. High-speed flight without window emission caused by flight-optical effect.