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glossary
Bragg angle ( acousto optic ): in Bragg configuration, angle between the incident rays and the equiphase planes of the ultrasonic wave propagating in the acousto optic crystal ; this angle is the opposite of the angle that the rays diffracted by the acousto optic crystal make with the equiphase planes
Wavelength ( of a light wave ): distance between two consecutive identical states of the electric ( or magnetic ) field
Acoustic frequency: frequency of an acoustic wave
Acoustic velocity: propagation speed of an acoustic wave
Acousto optic effect: diffraction of light in a material in which propagates an acoustic wave generating periodic variations in refractive index
