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(a) Four-level -type atomic system with four coupling laser beams and one probe beam. The dash-dotted lines are the two generated FWM signals. (b) Square box-pattern beam geometry used in the experiment. (c) Dressed-state picture for the -type atomic system.
(a) Probe transmission (with two ladder-type EIT or EIA window) vs the probe detuning for different values. (b) Measured two FWM signals versus for different values. The experimental parameters are , , , , and , , , 0, 154, 276, and , respectively.
(a) Measured evolution of the two FWM signals for different laser field ( and ) frequencies . (b) Theoretical plots of two FWM intensities vs for different values: , , , , , , and , 53, 117, 176, 270, 283, and , respectively.
Measured two FWM signals vs the probe detuning for different values, and : (a) , , and , 260, and , and (b) , , and , , 12, 92, 143, 180, 188, 262, and , respectively.
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