Phys. Rev. Lett. 88, 243604 (2002) [4 pages]Wave Equation for Dark Coherence in Three-Level MediaReceived 18 March 2002; published 4 June 2002 We report the derivation of a wave equation for coherence in “dark state” two-photon-resonance spectroscopy. One of its consequences is a dark state area theorem. The dark area theorem is a single ordinary differential equation which is globally equivalent, in a way we describe, to the full set of five coupled nonlinear partial differential equations that govern space-time evolution of two-pulse coherence in a lambda medium. The predictions of the dark area theorem are open to test via laser spectroscopy in dilute vapors and inhomogeneously broadened solids. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.243604
DOI:
10.1103/PhysRevLett.88.243604
PACS:
42.50.Gy, 42.50.Md, 42.62.Fi, 42.65.-k
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