Piezooptic effect
Encyclopedia
The piezooptic effect is manifest as a change in refractive index
Refractive index
In optics the refractive index or index of refraction of a substance or medium is a measure of the speed of light in that medium. It is expressed as a ratio of the speed of light in vacuum relative to that in the considered medium....

, n, of a material caused by a change in pressure on that material. Early demonstrations of the piezooptic effect were done on liquids. The effect has since been demonstrated in solid, crystalline materials.
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