Summary
The temperature variation of the refractive indices ofα-quartz contains a positive part, though it is completely submerged by the predominant negative part due to the thermal expansion. At theα-β transition temperature of 573°C., the structural changes represented by theα-β transformation cause a change in a direction opposite to that of the density change,i.e., an increase in the refractive indices. The rate of change of the electronic dispersion wave-lengths decreases with decreasing temperatures tending to zero at very low temperatures. The thermo-optic behaviour of quartz and vitreous silica bear a close resemblance, the difference in the two cases being due to the difference in the thermal expansions.
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Communicated by Sir C. V. Raman
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Ramdas, A.K. The thermo-optic behaviour of quartz. Proc. Indian Acad. Sci. (Math. Sci.) 35, 89 (1952). https://doi.org/10.1007/BF03172491
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DOI: https://doi.org/10.1007/BF03172491