Photoelastic constants of diamond

Ramachandran, G. N. (1947) Photoelastic constants of diamond Proceedings of the Indian Academy of Sciences, Section A, 25 (2). pp. 208-219. ISSN 0370-0089

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All the photoelastic constants of diamond have been determined for the first time. The three stress-optic coefficients are q11=4·2×10-11, q12=-3·6×10-11, q44=2·6×10-11, from which the elasto-optic coefficients have been deduced to be p11=0·125, p12=-0·325, p44=0·11. It is found that q11-q12 and q44 are both positive and also that the refractive index of the crystal should decrease when subjected to a hydrostatic pressure, both of which are unique for diamond among the cubic crystals studied so far. In the course of the investigation, a new technique has been developed for determining the absolute path retardation, based on the production of localised interference fringes by the light coming from the two surfaces of the crystal.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
ID Code:34569
Deposited On:01 Apr 2011 12:48
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