Abstract
A simplified procedure is proposed for the interferometric determination of optical dispersions of refractive-index changes in a low-Tg photorefractive (PR) polymer. A two-level model for the optical dispersions is used in order to separately evaluate the index changes occurring due to molecular birefringence and first-order electronic electro-optic effects. This evaluation is done by estimating the contributions of the two effects in the low-frequency limit of a modulating voltage. The evaluated results are compared with those determined by a PR two-beam coupling experiment.
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