Abstract
One knows that in three-level saturation spectroscopy the signal is generally related both to a population change process, induced by the saturating beam, and to a coherent process—two-photon or Raman coherence—induced by the simultaneous interaction of the saturating and probe fields. If the saturating beam couples two unpopulated states (transparent transition), a signal is still observable which originates solely from the coherent process.
© 1986 Optical Society of America
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