Abstract
Two-photon resonance Raman scattering associated with the giant two-photon absorption for generating excitonic molecule has been measured in CuCl crystals with simultaneous excitation by two laser beams which are incident on a crystal from different directions. A new Raman line has been observed in the higher energy region of the longitudinal exciton. Its energy depends on both the directions of beam incidence and observation, and the Raman line can be well explained as a result of the scattering of the upper-branch excitonic polariton.
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