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IEEE JQE
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.
Peter P. Sorokin, M.M.T. Loy, et al.
IEEE JQE
D. Grischkowsky, M.M.T. Loy
Applied Physics Letters
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