Abstract
The introduction of gas lasers has greatly increased the number of biascope applications. It has been found that optical waveguide effects caused by the refractive index gradient affected the biascope pattern but, provided that stress birefringence was distinguished, by analyser rotation, from intrinsic refractive index differences between guided modes, and that the birefringence and refractive index values were dissimilar, surface stress determination was possible. Birefringence and refraction patterns were recorded and compared for a variety of glasses.
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