Temporal modulation of light in complex acousto-optic arrangements explained by phase-vector analysis

Italo Gabrielli

doi:10.1117/12.330509

11 November 1998 Temporal modulation of light in complex acousto-optic arrangements explained by phase-vector analysis

Italo Gabrielli

Proceedings Volume 3581, Acousto-Optics and Applications III; (1998) https://doi.org/10.1117/12.330509
Event: Acousto-Optics and Applications III, 1998, Gdansk-Jurata, Poland

Abstract

The principles of the phase-vector analysis are recalled by transparencies showing elementary linear and sinusoidal diffracting agents. More complex acousto-optic systems are then analyzed which produce temporal modulated diffraction fringes. They are, in addition to a stationary field of stationary US waves: A) Two adjacent US beams propagating in opposite directions, with their frequencies in ratio 2/3. B) Two adjacent US beams of the same wavelength, propagating in two liquids with velocities in mutual ratio 3/2. C) One US beam of wavelength (Lambda) adjacent to an amplitude grating of constant K equals (Lambda) /3. D) One US beam adjacent to a phase grating of the same wavelength. The predictions are presented by plots reporting, as a function of time, the evolution of the amplitude and of the vector-angle of the light diffraction to a single fringe in the far-field. When the light vector-angle shows, in addition to the Doppler shift, frequency modulation, an additional plot shows such deviations from a linear angular evolution. Unattended predictions are presented, and their experimental verification is advised. The lecture is integrated by a videocassette, reporting the argument by animations.

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Italo Gabrielli "Temporal modulation of light in complex acousto-optic arrangements explained by phase-vector analysis", Proc. SPIE 3581, Acousto-Optics and Applications III, (11 November 1998); https://doi.org/10.1117/12.330509

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KEYWORDS

Diffraction

Modulation

Acousto-optics

Phase shift keying

Collimation

Complex systems

Doppler effect

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