Abstract
The two-photon polarization (TPP) spectra associated with the two-photon resonance of the excitonic molecule (EM) state via the upper or the lower exciton polariton branch are studied in the spatially dispersive region of CuCl at 1.6K under the resonant pumping of the respective polariton states to the EM's state by a strong laser beam. The selective annihilation of the exciton polaritons of one branch induces the prominent diminution of the TPP signal corresponding to the exciton polaritons of the other branch. The reflectivity of the incident light at the same energy that these polaritons have is also diminished remarkably by the pumping. A feature of the exciton polariton as a coherent coupled state composed of the exterior photons and the interior polaritons is discussed considering the role of the boundary.
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