Noncollinear acoustooptic tunable filters using TeO₂ crystals are described. An anisotropic Bragg diffraction is studied applying simple design expressions to a tilt type in which an acoustic wave is launched a little off the [110] axis. Tuning property, filter bandwidth, angular aperture, required acoustic power, deflection angle, divergenceless configuration, and rapid spectrum scanning have been discussed. These filter properties have been confirmed with measurements using three kinds of filter devices: a basic type, an acoustically enhanced type, and a large angular aperture type. A 5-Å bandwidth at 4000 Å was obtained by slow scanning. A 32-Å separation at 4000 Å was observed by a rapid scanning of 0.5 msec throughout the visible region with an extremely low electric drive power.

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