A.J. Schell-Sorokin, D.S. Bethune, et al.
Journal of Physical Chemistry
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.
A.J. Schell-Sorokin, D.S. Bethune, et al.
Journal of Physical Chemistry
C.C. Chi, M.M.T. Loy, et al.
Physical Review B
F. Budde, T.F. Heinz, et al.
Physical Review Letters
F. De Rougemont, H. Zacharias, et al.
QELS 1989