Temperature coefficient of electronic polarizability in optical glasses |
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Authors: | T Izumitani H Toratani |
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Affiliation: | Hoya Corporation, 572, Miyazawa-cho, Akishima-shi, Tokyo, Japan |
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Abstract: | The temperature coefficient of refractive index dn/dT and that of volume expansion β have been measured by an interferometric procedure designed to determine the coefficients simultaneously, with one sample. The temperature coefficient of electronic polarizability φ have been calculated from dn/dT and β. φ is expressed as the sum of the contributions of each glass component, φi·φi is expressed as follows: φi = ßiγi, where ßi is the thermal change in cation-oxygen distance and γi is the change in electronic polarizability due to the inter-ionic distance change. φi decreases as the ionic field strength z/a2 of the cation increases, which is the same tendency as that of ßi. γi, calculated from φi and ßi, gradually increases as z/a2 increases. This means that φi is mainly determined by the elongation of the inter-ionic distance, and it also suggests that the deformation of the electron cloud of oxygen ion due to the inter-ionic distance change, γi becomes larger, as the electronic polarizing power of the cation increases. |
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