An AOTF is an electronically tunable optical filter that selectively transmits or deflects light of specific wavelengths using the acousto-optic effect. A high-frequency acoustic wave is generated inside a crystal and periodically modulates its refractive index. An acousto-optic modulator consists of a piezoelectric transducer which creates sound waves in a material like glass or quartz. Wavelength tuning is electrically controlled through the applied RF frequencies. They are useful for applications that require high speed modulation of. Isomet's electronically controlled acousto-optic filters (AOTF) are specially designed for use with broadband light sources and are often used with non-coherent and divergent light.
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