Phys. Rev. A 56, 2221–2224 (1997)Electromagnetically induced transparency in cold free atoms: Test of a sum rule for nonlinear opticsReceived 3 April 1997; published in the issue dated September 1997 The resonance absorption line shape from cold (T<100 μK) atomic cesium vapor has been investigated with a probe laser after switching off the magneto-optical trapping fields. An additional nonabsorbed laser field has been used to produce quantum interference in a three-level ladder scheme. Predicted but counterintuitive modifications of the natural absorption line shape have been directly observed including inhibition of resonance absorption. The validity of a nonlinear sum rule deduced from the causality principle has been satisfactorily tested. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.56.2221
DOI:
10.1103/PhysRevA.56.2221
PACS:
42.50.Gy, 42.62.Fi
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