Acousto-optic tunable filter transmission characteristic analysis for incident cone of light

Yan Cui; Minghui Zhang

doi:10.1117/12.131284

26 October 1992 Acousto-optic tunable filter transmission characteristic analysis for incident cone of light

Yan Cui, Minghui Zhang

Proceedings Volume 1814, Optical Sensors; (1992) https://doi.org/10.1117/12.131284
Event: International Symposium on Optoelectronics in Computers, Communications, and Control, 1992, Hsinchu, Taiwan

Abstract

Acousto-optic tunable filter (AOTF) is an electronically tuned optic filter that operates on the principle of acousto-optic diffraction. It consists of a birefringent crystal to which a piezoelectric transducer is bonded. The transducer converts the rf signal applied on it to acoustic wave, the acoustic wave launched into the crystal modulates the index of refraction of crystal periodically. This provides a moving phase grating which will diffract portions of incident light beam. For a fixed acoustic frequency, only a limited spectral band of incident light can approximately satisfy the phase-matching condition and be diffracted by the filter. The center of the band will change with the acoustic frequency, i.e., rf signal frequency. Thus a spectral filter is created. AOTF has advantages of wide tuning range, high spectral resolution, large angular aperture, and fast scan rate. These advantages make AOTF attractive for a variety of applications.

Citation Download Citation

Yan Cui and Minghui Zhang "Acousto-optic tunable filter transmission characteristic analysis for incident cone of light", Proc. SPIE 1814, Optical Sensors, (26 October 1992); https://doi.org/10.1117/12.131284

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KEYWORDS

Acoustics

Acousto-optics

Optical filters

Solids

Transmittance

Crystals

Spectral resolution

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