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The light-scattering width of a perfect dislocation in an insulating crystal is calculated. The contribution of the strain field around the dislocation to the change in dielectric constant is considered along with the core contribution. The strain-field contribution to the scattering width is inversely proportional to the wavelength of light. In most of the dielectric crystals considered here, the contribution of the former to light scattering is much more than that due to the latter. The estimated turbidity associated with the light scattering by dislocations in alkali halide crystals is of the same order as observed experimentally for pure crystals.
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Sahoo et al. (1983) studied this question.
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