Dispersion of the photoelastic constants of fused silica

Jog, E. S. ; Krishnan, R. S. (1957) Dispersion of the photoelastic constants of fused silica Nature, 179 (4558). pp. 540-541. ISSN 0028-0836

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Related URL: http://dx.doi.org/10.1038/179540b0


Among amorphous substances, vitreous silica occupies a favoured place as it consists of a single chemical constituent. A systematic investigation of the dispersion of its photoelastic constants is therefore of great importance. Filon and Harris measured the stress optical coefficient of fused silica over the range of wave-length 4600-6500 A. Although they reported the presence of dispersion of the stress optic coefficient, the results were not conclusive, for the range of wave-lengths studied by them was restricted. The piezo-optic constants q 11 and q 12 and the stress optical coefficient C=[-n2/2(q12-q11)]have been measured by us for the range of wave-lengths 2250-5700 A. The specimen of fused silica used in the present experiments was obtained from the Thermal Syndicate,Ltd., England. The values of q 11 and q 12 were determined by measuring the fringe shifts for known additional loads, and the value of C was measured by adopting the method used by Filon and Harris, which was suitably modified to get more accurate results. In both cases a photographic technique was used.

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