Cryogenic large bandwidth acoustooptic deflectors.
At high frequencies (~1 GHz) acoustic attenuation severely limits the time aperture of acoustooptic deflectors (AOD). It is shown in this paper that decreasing the operating temperature of an AOD to ~4 K significantly reduces the acoustic attenuation. Due to this decrease in attenuation, at a fixed bandwidth the time-bandwidth product of an AOD is increased. Measurements are presented for a longitudinal mode tellurium dioxide AOD which demonstrate up to a factor of 10 increase in the time-bandwidth product.
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