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Publication
Physical Review Letters
Paper
Two-photon adiabatic inversion
Abstract
This Letter reports the first experimental observation of population inversion of a two-photon transition in NH3 using the adiabatic rapid-passage technique. The population inversion was demonstrated by the observation of stimulated two-photon gain and emission. By use of this technique, the two-photon population relaxation time T1 was measured. © 1978 The American Physical Society.