Abstract
AbstractThis paper describes the development of an infrared tunable acousto -optic filter. A Te02noncollinear filter was designed, constructed and tested for operation in the range of 2.5to 5.5 micrometers. The filter has a measured spectral resolution of 16 cm-1 at a f/2.5aperture. Application of the filter to optical coherence detection in the infrared is de- scribed. IntroductionThe tunable acousto -optic filter (TAOF) is an electronically tuned optical filter thatoperates on the principle of acousto -optic diffraction in an optically anisotropic medium.The spectral bandpass of the filter can be rapidly tuned over wide spectrum regions, simplyby changing the frequency of the applied RF signal. Some of the salient features of theTAOF include large angular aperture while maintaining high spectral and imaging resolution,electronic tuning with fast scan rate, wide tuning range without secondary passbands, highoptical transmission with moderate drive power, and the capability of operating in sequen-tial, random access, multiwavelength modes. In addition, the all- solid -state TAOF is ruggedand has no moving parts. These features make the TAOF potentially attractive for a varietyof applications.Various TAOF configurations utilizing both
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