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DataRay Inc. - ISO 11146-Compliant Laser Beam Profilers
Photonics Dictionary

acousto-optic modulation

Acousto-optic modulation refers to the process of using acoustic waves to modulate the properties of light passing through an optically transparent material. This modulation occurs due to the acousto-optic effect, where the refractive index of the material is periodically altered by the passing acoustic wave. As a result, the phase, intensity, polarization, or direction of the light beam can be controlled and modulated in real-time.

Key points about acousto-optic modulation include:

Mechanism: Acoustic waves propagating through the material create periodic variations in the refractive index, forming a diffraction grating. This grating interacts with the incident light, causing it to be diffracted or redirected based on the frequency and amplitude of the acoustic wave.

Modulation types:

Intensity modulation: The intensity of the light beam is modulated by changing the amplitude of the acoustic wave.

Phase modulation: The phase of the light wave is modulated by varying the phase of the acoustic wave.

Frequency modulation: The frequency of the acoustic wave determines the frequency modulation of the light.

Applications: Acousto-optic modulation finds applications in various fields such as telecommunications (for signal processing and modulation), laser technology (for beam steering and modulation), spectroscopy (for wavelength selection and tuning), and optical imaging (for real-time control of light properties).

Acousto-optic modulators are valued for their ability to achieve high-speed modulation and control over light beams, making them essential components in advanced optical systems requiring rapid and precise manipulation of optical signals.
 

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