The elasto-optic effect:

tex2html_wrap103 . For most transparent materials, you get: tex2html_wrap104 = plasma frequency/something like plasma frequency.

tex2html_wrap105 where tex2html_wrap106 is the strain tensor. The tex2html_wrap107 is of order1.

This is the stress induced birefringence of the material.

phase difference is tex2html_wrap108

Standard definition is tex2html_wrap109 where C is a Brewster= tex2html_wrap110

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