Abstract
We report on Raman echo measurements of the ground-state hyperfine transition. Using Raman echoes in zero magnetic field the ground-state hyperfine coherence time was observed to be . When an external magnetic field was applied, the dephasing time of the hyperfine transition was observed to decay nonexponentially, with a decay rate of . This nonexponential decay is indicative of the presence of spectral diffusion, similar to that observed in . This work indicates that under favorable conditions we can expect hyperfine coherence times longer than the value of recently reported in .
© 2007 Optical Society of America
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