Diamond is the only material that owns light transmission, thermal shock resistance, and high impact on water and solid particles as well as chemical corrosion. Diamond has extremely excellent optical properties, from UV (0.22μm) to far infrared, and to the microwave band, except in 4 ~ 6μm position there is a small intrinsic absorption peak, no other absorption peaks. In addition, the diamond also has the highest hardness and elastic modulus, the highest thermal conductivity, very low thermal expansion coefficient, very low dielectric loss and excellent chemical stability, is the ideal optical window material.

Supersonic missile (aircraft) infrared or radar optical window

Commonly used infrared window materials are ZnS and ZnSe, although they have good infrared transmission capacity, but physical properties are relatively fragile, vulnerable to damage. In the military and non-conventional use, the requirements of the infrared window are very strict. Diamond film is a high quality surface material, with infrared penetration characteristics; at the same time the diamond film is also as a good infrared window of the anti-reflective film material. In addition, the diamond's high thermal conductivity, wear resistance and other splendid characteristics can also be a good way to protect the infrared window from external shocks. The results show that the performance of the domestic optical grade diamond film can not only meet the application requirements of the ultrasonic optical window of the supersonic missile (aircraft), but also provide infrared optical window materials with the anti-thermal shock, sand erosion and rain erosion under extreme conditions for other related applications in China .

High power industrial CO2 laser window and microwave window

The optical grade diamond film has almost no thermal lens effect due to the fact that the thermal conductivity is very high (100 times of ZnSe) under water cooling conditions with little temperature rise. Studies have shown that optical grade diamond film CO2 laser damage threshold up to 226kw/cm2 even can be used for hundreds of kilowatts of power laser window without any problems. Besides, the hardness and strength of the diamond film, the optical grade diamond film window is actually a "never destroyed" window. Optical grade CVD diamond film in the microwave band dielectric loss is very low, turn out to be a high-power microwave window ideal material. For now, there are a lot of successful applications.

Great anti-abrasion and friction resistance optical window for extreme harsh environments

Optical grade diamond films can be used for extreme friction and wear, high temperature, radiation and strong corrosion environment due to their excellent properties combination of maximum hardness, maximum thermal conductivity, very low coefficient of thermal expansion, high mechanical strength and excellent chemical stability. In addition to military applications, in the metallurgical, chemical, mining, petrochemical, nuclear industry and other civilian areas are going to be with great application prospects.

Key cooling element high power traveling tube

The traveling wave tube at home and abroad is widely used as a support block of BeO, and plays a dual role of insulation and heat conduction. But the thermal conductivity of BeO is limited, can not meet the requirements of high power and high frequency traveling wave tube, and with highly toxic. Optical grade diamond film thermal conductivity is very high, and with a very low microwave dielectric loss, it can be used in high-power electronic components of the thermal materials. The application of optical grade diamond film in high power traveling wave tube is one of the most successful cases.

Luoyang Yuxin Diamond Co., Ltd produces Chemical Vapor Deposition (CVD) diamond film, which 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. 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.

Comparison of parameters of available products