Why for determination of velocity of ultrasound acousric optic effect is used?
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optics, acoustics has a history of similar duration, again starting with the ancient Greeks.[2] In contrast, the acousto-optic effect has had a relatively short history, beginning with Brillouin predicting the diffraction of light by an acoustic wave, being propagated in a medium of interaction, in 1922.[3] This was then confirmed with experimentation in 1932 by Debye and Sears,[4] and also by Lucas and Biquard.[5]
The particular case of diffraction on the first order, under a certain angle of incidence, (also predicted by Brillouin), has been observed by Rytow in 1935. Raman and Nath (1937) have designed a general ideal model of interaction taking into account several orders. This model was developed by Phariseau (1956) for diffraction including only one diffraction order.
In general, acousto-optic effects are based on the change of the refractive index of a medium due to the presence of sound waves in that medium. Sound waves produce a refractive index grating in the material, and it is this grating that is "seen" by the light wave.[6] These variations in the refractive index, due to the pressure fluctuations, may be detected optically by refraction, diffraction, and interference effects,[7] reflection may also be used.
The particular case of diffraction on the first order, under a certain angle of incidence, (also predicted by Brillouin), has been observed by Rytow in 1935. Raman and Nath (1937) have designed a general ideal model of interaction taking into account several orders. This model was developed by Phariseau (1956) for diffraction including only one diffraction order.
In general, acousto-optic effects are based on the change of the refractive index of a medium due to the presence of sound waves in that medium. Sound waves produce a refractive index grating in the material, and it is this grating that is "seen" by the light wave.[6] These variations in the refractive index, due to the pressure fluctuations, may be detected optically by refraction, diffraction, and interference effects,[7] reflection may also be used.
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