The application of a variation of intensity method using static uniaxial compressive stress and polarized light to measure stresshyphen;induced birefringence in the infrared wavelength region (quest;1 to 12 mgr;m) is described. The measurements were made at 296thinsp;deg;K for the following materials: KCl, KBr, KI, NaCl, LiF, ZnS, ZnSe, SrF2, CaF2, MgF2, and a chalcogenide glass TIhyphen;1173; for the alkali halides the values of the stress optic coefficients obtained are in the range sim;1ndash;4 Brewsters, while for the nonoxide glasses values of 9ndash;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 sim;2.
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