Summary
The temperature coefficients of refraction of lithium fluoride, fluorspar, magnesia and quartz have been determined interferometrically for wavelengths betweenλ 2500 andλ 6000, from room temperature to 400°C. The values have been utilised, in conjunction with dispersion formulæ mostly proposed by the author, to calculate the temperature dependence of the ultra-violet frequencies, using Ramachandran’s theory of thermo-optic behaviour. The theory is found to account successfully for the variation ofdn/dt with wavelength and temperature. Similar results have been obtained in the visible region alone for the three refractive indices of barite.
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Communicated by Professor R. S. Krishnan,f.a.sc.
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Radhakrishnan, T. Further studies on the temperature variation of the refractive index of crystals. Proc. Indian Acad. Sci. (Math. Sci.) 33, 22–34 (1951). https://doi.org/10.1007/BF03172255
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DOI: https://doi.org/10.1007/BF03172255