Definition of acousto-optic deflector

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Photonics Dictionary

acousto-optic deflector: An acousto-optic deflector (AOD) is a type of device that utilizes the acousto-optic effect to control the direction of light beams. It operates by modulating the refractive index of an optically transparent material (such as a crystal or glass) with an acoustic wave, which in turn diffracts incident light passing through the material.

Key features of acousto-optic deflectors include:

Mechanism: AODs typically consist of a transparent medium through which an acoustic wave propagates. The acoustic wave creates periodic variations in the refractive index of the medium, forming a diffraction grating. This grating deflects incident light based on the angle and frequency of the acoustic wave.

Control: By adjusting the frequency and intensity of the acoustic wave, the deflection angle of the light beam passing through the AOD can be precisely controlled. This allows for rapid and precise steering of laser beams or other coherent light sources.

Applications: Acousto-optic deflectors are used in various applications such as laser scanning microscopy, laser printing, laser radar systems, optical tweezers for manipulating microscopic particles, and in laser beam steering for telecommunications and optical communication networks.

Acousto-optic deflectors are valued for their high-speed performance, accuracy, and versatility in directing light beams, making them essential components in advanced optical instrumentation and laser technology.

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