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glossary
- Refraction index: for a transparent medium, ratio between the light speed in the air and the light speed in the medium ; for a reflective surface in the air or vacuum, the refraction index is « - 1 »
- Frequency: reverse value of the period
- Acousto optic effect: diffraction of light in a material in which propagates an acoustic wave generating periodic variations in refractive index
- Wavelength ( of a light wave ): distance between two consecutive identical states of the electric ( or magnetic ) field
- Interaction length ( acousto optic ): in an acousto optic crystal, defines the length of the zone perpendicular to the direction of propagation of the acoustic wave in which the interaction between acoustic and light waves occurs
- 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
- Merit factor ( acousto optic ): value depending on some physical parameters of a material and characterizing its acousto optic performances