Abstract
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.
© 1976 Optical Society of America
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