The crystal Center has made progress in thermal management of laser crystals

Diamond, as a solid material with the highest known thermal conductivity, is one of the most concerned materials in the thermal management field of high power devices. Previously, the Crystal Center research team proposed a method to deposit diamond film directly on the surface of the laser crystal, which effectively improves the heat transfer capacity of the laser crystal and greatly reduces the technical cost compared to the bonding process.

Recently, the crystal center has made progress in laser crystal thermal management. Based on the previous work, we propose to use Cr transition layer to deposit diamond polycrystalline films on titanium gems. Cr transition layer can effectively alleviate the lattice mismatch and thermal mismatch between diamond and titanite, and improve the interface bonding ability. Microwave plasma chemical vapor deposition (MPCVD) was used to prepare 51 μm intact and uniform polycrystalline diamond film on titanite substrate. The internal stress of the film was 0.97 GPa. The thermal expansion coefficient of titanite sample was increased by 17% after diamond film deposition. At the same time, the formation of C-Cr bond at the interface is revealed by first principles calculation. Direct diamond deposition technology is expected to be widely used in laser crystal thermal management. Relevant results are summarized as "Effective diamond deposition on Ti: sapphire with a Cr interlayer via microwave plasma chemical vapor deposition "was published at CrystEngComm.

The work was supported by the National Natural Science Foundation of China.

Source: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences