Measurements of stress anisotropy in fiber preform: modification of the dynamic spatial filtering technique.
A system for measuring the ray deflection function and retardation function related to preform birefringence is presented. It enables determination of the refractive-index profile and its anisotropy as well as the stress components within the same cross section of a preform. The system can be easily switched from measurement of the deflection function to measurement of the retardation function by moving a single element. Exemplary results of measurements are given. We note that preform anisotropy induced by stress may bring about additional errors in measurements of the refractive index by nondestructive methods.
Urbańczyk
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Pietraszkiewicz
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