18 July 1988 A Comprehensive Model For The Intrinsic Transmission Properties Of Optical Windows
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Abstract
Current applications of optical window materials require a compre-hensive characterization of the index of refraction and absorption coefficient as a function of frequency and temperature. General models of multiphonon absorption and one-phonon resonances are used to characterize the complex index of refraction of polar crystals. Experimental data from 100 to 5000 cm -1 at a variety of temperatures are used to determine physically meaningful parameters in the models. Extrapola-tions outside the experimental range of temperature and frequencies are valid. Thus, the model is of great utility. A review of the theory used in this model is given. Results of the application of the model to oxides, fluorides, and alkali halides are also presented. The absorption coefficient from 105 to 10 -5 cm -1 and the index of refraction from radio frequency to visible are obtained.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael E Thomas, Richard I Joseph, "A Comprehensive Model For The Intrinsic Transmission Properties Of Optical Windows", Proc. SPIE 0929, Infrared Optical Materials IV, (18 July 1988); doi: 10.1117/12.945855; https://doi.org/10.1117/12.945855
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