Stress-induced birefringence of solids transparent to 1- to 12-μm light

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Abstract
The application of a variation of intensity method using static uniaxial compressive stress and polarized light to measure stress‐induced birefringence in the infrared wavelength region (?1 to 12 μm) is described. The measurements were made at 296 °K for the following materials: KCl, KBr, KI, NaCl, LiF, ZnS, ZnSe, SrF2, CaF2, MgF2, and a chalcogenide glass TI‐1173; for the alkali halides the values of the stress optic coefficients obtained are in the range ∼1–4 Brewsters, while for the nonoxide glasses values of 9–14 Brewsters were measured. Comparisons of measurements from experiments with a theoretical model which predicts the wavelength dispersion of stress birefringence cannot be fitted better than a factor of ∼2.

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