As with optics, acoustics has a history of similar duration, again starting with the ancient Greeks. Optics has had a very long and full history, from ancient Greece, through the renaissance and modern times. It can be used in nondestructive testing, structural health monitoring and biomedical applications, where optically generated and optical measurements of ultrasound gives a non-contact method of imaging. ![]() ![]() Technical progress in both crystal growth and high frequency piezoelectric transducers has brought valuable benefits to acousto-optic components' improvements.Īlong with the current applications, acousto-optics presents interesting possible application. This is due to the increasing availability and performance of lasers, which have made the acousto-optic effect easier to observe and measure. However, the growing principal area of interest is in acousto-optical devices for the deflection, modulation, signal processing and frequency shifting of light beams. The acousto-optic effect is extensively used in the measurement and study of ultrasonic waves. These variations in the refractive index, due to the pressure fluctuations, may be detected optically by refraction, diffraction, and interference effects reflection may also be used. Sound waves produce a refractive index grating in the material, and it is this grating that is "seen" by the light wave. ![]() 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. Acousto-optics is a branch of physics that studies the interactions between sound waves and light waves, especially the diffraction of laser light by ultrasound (or sound in general) through an ultrasonic grating.Ī diffraction image showing the acousto-optic effect.
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