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Temperature coefficient of the refractive index for PbTe film

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Abstract

Specimens of PbTe single film are deposited on Ge substrates by vacuum thermal evaporation. During the temperature range of 80–300 K, the transmittance of a PbTe film within 2–15 μm is measured every 20 K by the PerkinElmer Fourier transform infrared spectroscopy cryogenic testing system. Then, the relationship between the refractive index and wavelength within 7–12 μm at different temperatures is received by the full spectrum inversion method fitting. It can be seen that the relationship conforms to the Cauchy formula, which can be fitted. Then, the relationship between the refractive index of the PbTe film and the temperature/wavelength can be expressed as n(λ,T)=5.82840?0.00304T+4.61458×10?6T2+8.00280/λ2+0.21544/λ4, which is obtained by the fitting method based on the Cauchy formula. Finally, the designed value obtained by the formula and the measured spectrum are compared to verify the accuracy of the formula.

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DOI:10.3788/col201715.043101

所属栏目:Thin films

收稿日期:2016-09-20

录用日期:2017-01-13

网络出版日期:2017-02-14

作者单位    点击查看

Lingmao Xu:Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730001, China
Hui Zhou:Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730001, China
Yanchun He:Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730001, China
Kaifeng Zhang:Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730001, China
Shenghu Wu:Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730001, China
and Yuqing Xiong:Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730001, China

联系人作者:联系作者(zhouhui510@sina.com.cn)

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引用该论文

Lingmao Xu, Hui Zhou, Yanchun He, Kaifeng Zhang, Shenghu Wu, and Yuqing Xiong, "Temperature coefficient of the refractive index for PbTe film," Chinese Optics Letters 15(4), 043101 (2017)

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