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About: Acousto-optic deflector     Goto   Sponge   NotDistinct   Permalink

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An acousto-optic deflector (AOD) spatially controls the optical beam. In the operation of an acousto-optic deflector the power driving the acoustic transducer is kept on, at a constant level, while the acoustic frequency is varied to deflect the beam to different angular positions. The acousto-optic deflector makes use of the acoustic frequency dependent diffraction angle, where a change in the angle as a function of the change in frequency given as, where is the optical wavelength and is the velocity of the acoustic wave.