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Spectroscopic small loss measurements on infrared transparent materials

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Abstract

Small losses of NaCl, KBr, TlCl, KRS-5, CsI, and PbI2 near 10 μm were measured using an improved differential infrared spectrophotometer with an accuracy better than 0.1% in transmittance. TlCl shows relatively large intrinsic multiphonon absorption, whereas the others show only impurity loss. PbI2, with the possibility of glass formation, shows its infrared absorption proportional to exp(−ω/37.5), where ω is the frequency in cm−1.

© 1980 Optical Society of America

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