Definition of acousto-optic tunable filter

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Photonics Dictionary

acousto-optic tunable filter: An acousto-optic tunable filter (AOTF) is a device that utilizes the acousto-optic effect to selectively filter and transmit light based on its wavelength or frequency. It operates by applying an acoustic wave to an optically transparent material (such as a crystal or glass), which creates periodic variations in the refractive index of the material. These variations act as a diffraction grating that disperses incident light according to its wavelength.

Key features and functions of acousto-optic tunable filters include:

Tuning mechanism: The wavelength of light transmitted through the AOTF can be adjusted by varying the frequency of the acoustic wave applied to the material. This allows for rapid and precise tuning of the filter without mechanical movement.

Selective filtering: AOTFs can selectively filter and transmit light within a specific wavelength range determined by the characteristics of the acoustic wave. This capability makes them useful for applications such as spectroscopy, where precise control over wavelength selection and scanning is required.

Non-mechanical operation: Unlike traditional optical filters that require mechanical adjustment or swapping, AOTFs offer electronic control over wavelength tuning, making them suitable for dynamic and real-time applications.

Applications: AOTFs find applications in various fields including hyperspectral imaging, fluorescence microscopy, telecommunications (for wavelength division multiplexing), remote sensing, and biomedical diagnostics. They are particularly valued in spectroscopy for their ability to rapidly scan through wavelengths and selectively isolate spectral bands of interest.

Acousto-optic tunable filters are valued for their high-speed wavelength tuning, narrow bandwidth, and ability to operate over a wide range of wavelengths, making them essential components in advanced optical instrumentation and imaging systems.

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