In this paper we report acoustooptic tunable filters (AOTF) for the infrared made using thalium arsenic selenide in a collinear configuration. Resolution near 1 wave number can be achieved for interaction lengths of 5-cm, provided the optical uniformity is sufficiently high. Resolution measurements in collinear AOTFs is complicated by acoustic resonances. We have analyzed the temporal response of an AOTF to pulsed rf excitation, in which there are no resonances and from which the resolution can be inferred. We have applied this analysis to a 4-cm interaction length AOTF and determined a uniformity in the optical birefringence of a few parts in 10,000. This was in good agreement with an interpretation of linear sweep frequency response measurements.
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