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Temperature and Thickness Dependence of IR Optical Properties of Sapphire at Moderate Temperature

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Abstract

IR optical properties of a UV grade sapphire are reported at moderate temperatures, up to 500 °C. The spectral transmittance of the sapphire is obtained as a function of temperature and thickness. With extinction and reflection coefficients obtained by fitting the transmittance curves, the emittance and reflectance of the sapphire are calculated as a function of wavelength and thickness, showing the thickness dependence in a semi-transparent region of the sapphire. The directly measured emittances of the sapphire by a substrate heating method agreed well overall with the calculated emittances from transmittances.

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Authors and Affiliations

  1. Korea Research Institute of Standards and Science, Daejon, Republic of Korea

    Geun Woo Lee, Sangho Jeon, Seung-Nam Park, Yong Shim Yoo & Chul-Woong Park

  2. University of Science & Technology, Daejon, Republic of Korea

    Geun Woo Lee, Sangho Jeon & Seung-Nam Park

Authors
  1. Geun Woo Lee
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  2. Sangho Jeon
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  3. Seung-Nam Park
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  4. Yong Shim Yoo
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  5. Chul-Woong Park
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Correspondence to Geun Woo Lee.

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Lee, G.W., Jeon, S., Park, SN. et al. Temperature and Thickness Dependence of IR Optical Properties of Sapphire at Moderate Temperature. Int J Thermophys 32, 1448–1456 (2011). https://doi.org/10.1007/s10765-011-0990-2

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  • DOI: https://doi.org/10.1007/s10765-011-0990-2

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