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(a) Four-level atomic system used in experiment. (b) Normal phase-matching configuration with propagating in the opposite direction of . (c) Abnormal configuration where and intersect with a small angle .
(a) Transmitted probe (top curves), FWM (middle curves), and fluorescence (bottom curves) signals versus with and blocked and for different : (a1) , (a2) , (a3) . Powers of participated laser beams are , , and . (b1)–(b3) Calculations of the transmitted probe signals corresponding to the results in (a1)–(a3).
(a), (b) The transmitted probe (top curves), FWM (middle curves), and fluorescence (bottom curves) signals versus at discrete with blocked and at (a) and (b). Powers of the participated laser beams are , , , and . (c), (d) Theoretical calculations corresponding to (a), (b).
The transmitted probe ((a1) and (b1)), FWM ((a2) and (b2)), and fluorescence ((a3) and (b3)) signals versus at different relative phase , , , , , and from the bottom totop.(a) Signals obtained with and blocked,, , , and . (b) Signals obtained with blocked, , , , , , and .
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