Improving the Infrared Transmission of Sapphire by SiO2 Films

doi:10.3724/SP.J.1077.2007.00529

Abstract

Abstract:

Improving the infrared transmission of sapphire can increase the reliability and accuracy of infrared detector. SiO₂ coatings were prepared on sapphires by radio frequency magnetron reactive sputtering. Infrared transmissions of coated and uncoated sapphires at high temperatures and after rain erosion tests were investigated. Results show that the prepared SiO₂ films can increase the transmission of sapphire in mid-wave IR greatly. At high temperatures, SiO₂ films have an anti-reflective effect on sapphire substrates and so the coated sapphires have a higher average transmittance than the uncoated ones. After rain erosion tests, average transmission decreases a little in the wavelength range from 3 to 5μm for coated sapphires. In addition, sapphires coated with SiO₂ films have a higher transmittance than uncoated ones after rain erosion.

Key words: sapphire, infrared transmission, SiO2 film, rain erosion

CLC Number:

TN213

FENG Li-Ping,LIU Zheng-Tang,LI Qiang. Improving the Infrared Transmission of Sapphire by SiO₂ Films[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.00529.

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Improving the Infrared Transmission of Sapphire by SiO₂ Films

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