Three categories of acousto-optic devices will be mainly discussed in this report. They include the acousto-optic modulator, filter and deflector.
Acousto-optic modulator
By varying the parameters of the acoustic wave, including the amplitude, phase, frequency and polarization, properties of the optical wave may be modulated. The acousto-optic interaction also makes it possible to modulate the optical beam by both temporal and spatial modulation.
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A simple method of modulating the optical beam travelling through the acousto-optic device is done by switching the acoustic field on and off.