Abstract
Doppler-free two-photon dispersion has been observed in rubidium vapor near the $5{S}_{\frac{1}{2}}\ensuremath{-}5{D}_{\frac{5}{2}}$ two-photon transition. The experiment was performed by looking at the shape of the transmission peaks of a Fabry-Perot cavity filled with rubidium. When the nonlinear susceptibility is large, a bistable behavior occurs. A nonperturbative treatment of the susceptibility is required for the interpretation of these results.
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