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(a) Energy levels of the atoms. : initial state preparation laser; , : the write lasers; and : the generated Raman Stokes signals. (b) The timing diagram. (c) Experimental setup. BF: bandpass filter; (b): backward propagating; and (f): forward propagating.
The intensities in arbitrary units (A.U.) of Stokes fields of vs the time. The black squares and the red circles are the Stokes field with and without the first pump pulse , respectively. (a) copropagating case (b) counterpropagating case. (c) is the Stokes 2 signal after FP interferometer. The solid (dotted) line is , generated in forward (backward) pumping case. The four peaks marked by two circles are the frequency components of and the other four peaks marked by two ellipses denote the frequency components of .
The peak intensity of Stokes signal vs (a) the delay time and (b) the intensity of .
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