Temperature dependence of self-induced transparency in ruby
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We report for the first time a study of the effects of phase relaxation on self-induced transparency (SIT) in a simple two-level system. Utilizing a ruby attenuator whose temperature was varied from 5-60K, we observed considerable diminution of anomalous transmission and pulse delay once the phase relaxation time T12 approached the pulse width t. The effects of a finite phase memory were greatest for {reversed tilde equals} pulses, but were considerably less for >;2 pulses. These results are consistent with theoretical predictions for two-level systems. 1971.