Thermal Management of Tungsten by Spectrally Selective Thin Film Optical Filter under Laser Illumination

Official URL: https://risc01.sabanciuniv.edu/record=b3205718

Surface temperature management of refractory metals, such as Tungsten, is crucial for their use in high-temperature applications like aerospace, defense, and laser instruments. In the presented work, distributed Bragg reflectors (DBR) are utilized to reduce the temperature caused by intense laser illumination. To address this problem, we developed a coupled optical and thermal model and investigated multiple factors, including material composition, morphology, architecture, and source-related parameters, such as wavelength. Our results indicate that our DBR coating designs can significantly decrease the temperature of the Tungsten. Moreover, we observed that at higher laser power, the radiative heat transfer and surface emissivity play a prominent role in decreasing temperature, contributing to 32% of the cooling processes. However, at low laser powers, conductive heat transfer is the dominant mechanism, which accounts for 93%.