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Radiation induced changes to the polarization states oflight pnpagating in various photonic devices have been observed. This paper reports on the nature ofthe polarization changes in one particular photonic device -the acousto optic Bragg cell. A short description ofthe detection methodology used to quantify transient changes to the polarization states and to the degree ofpolarization in Tellurium Dioxide and Gallium Phosphide Bragg cells are presented. A discussion of the Stokes parameter analysis used to interpret the data is also presented.