Results of theoretical and experimental investigation of acoustic beam walk-off influence on acousto-optic characteristics in a paratellurite single crystal are presented. Variants of isotropic and anisotropic diffraction are analyzed. Angular and frequency characteristics of acousto-optic interaction are calculated on the basis of modified Raman–Nath equations in wide ranges of Bragg angles and acoustic frequencies. It is established that the acoustic walk-off can change essentially the width of acousto-optic range. Therefore this effect should be taken into consideration at designing acousto-optic instruments. Experimental verification of the numerical calculations is fulfilled with an acousto-optic cell made of paratellurite cut.
42.79.Jq Acousto-optical devices
Department of Oscillation Physics, Faculty of Physics, M.V.Lomonosov Moscow State University. Moscow 119991, Russia.
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