Anisotropic light diffraction in crystals with a large acoustic-energy walk-offстатья
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Аннотация:The influence of energy walkoff in an acoustic beam on the characteristic of anisotropic Bragg diffraction of light has been investigated by the example of paratellurite crystal. The angular and frequency characteristics of acousto-optic diffraction have been calculated in wide ranges of ultrasound frequencies and Bragg angles using the modified Raman–Nath equations. It is shown that the walkoff of an acoustic beam
may change (either widen or narrow) significantly the frequency and angular ranges. The calculation results
have been experimentally checked on an acousto-optic cell made of 10.5°cut paratellurite crystal.