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Journal of Inorganic Materials

Journal of Inorganic Materials >

2007 , Vol. 22 >Issue 3: 529 - 533

DOI: https://doi.org/10.3724/SP.J.1077.2007.00529

Research Paper

Improving the Infrared Transmission of Sapphire by SiO2 Films

  • FENG Li-Ping
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  • Lab of Solidification processes, College of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

Received date: 2006-06-30

  Revised date: 2006-08-24

  Online published: 2007-05-20

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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

Cite this article

FENG Li-Ping . Improving the Infrared Transmission of Sapphire by SiO2 Films[J]. Journal of Inorganic Materials, 2007 , 22(3) : 529 -533 . DOI: 10.3724/SP.J.1077.2007.00529

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