Abstract
Birefringence as high as 10 -2 + 10 -3 in ion-exchanged planar waveguides has been measured by using a double Lloyd's interferometer. Birefringence seems to be produced by the distribution of the mechanical stresses induced during the fabrication process. A new point-by-point calculation to fit the experimental data is proposed which can give new information about the ion-diffusion process and the stress distribution.
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