Abstract
Abstract In the ultrasonic light diffraction phenomena in an isotropic medium in the intermediaterange (between Raman-Nath and Bragg) variations in polarization state of diffracted light have been predicted and experimentally observed. In the paper some experimental and numericalresults for 0 order of light diffracted by ultrasonic wave of 50 MHz frequency are presented.A possibility of continuous control of the polarization state from linear to eliptical or circular against the Raman-Nath parameter has been confirmed in good agreement between theoreticaland experimental values.Keywords: ultrasonic light diffraction, intermediate range, polarization effects, fused silica. 1 . Introduction It has been shown in our previous theoretical papers [1,2] that optical polarizationeffects appearing in an isotropic medium with ultrasonically induced anisotropy have apeculiar behaviour within the intermediate ultrasonic light diffraction range (i.e. between the Raman-Nath and Bragg type diffraction regimes).
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