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Two-Photon Near-Resonance Light Scattering from an Atomic Level

1977; American Physical Society; Volume: 38; Issue: 8 Linguagem: Inglês

10.1103/physrevlett.38.390

1092-0145

J. Liran, Liron Levin, G. Erez, Joshua Jortner,

Random lasers and scattering media

We have studied the time-resolved spectra, the energy-resolved spectra, and the total intensity of light emission induced by near-resonance two-photon excitation to the $4^{2}D_{\frac{3}{2}}$ and $4^{2}D_{\frac{5}{2}}$ levels of Na over the detuning range $\ensuremath{-}7 {\mathrm{cm}}^{\ensuremath{-}1}<~\ensuremath{\Delta}<~7 {\mathrm{cm}}^{\ensuremath{-}1}$. The time-resolved spectra of Na perturbed by Ar exhibit a fast adiabatic component and a slow resonance-fluorescence component. The cross section for phase-shifting, ${T}_{2}$-type collisions in this atomic system is $\ensuremath{\sigma}=110\ifmmode\pm\else\textpm\fi{}20$ ${\mathrm{\AA{}}}^{2}$.