Picosecond Induced Absorption in CuCl: A New Approach to the Determination of Additional Boundary Conditions

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Abstract
Two induced-absorption lines from the upper- and the lower-branch excitonic polaritons to the excitonic molecule were observed in CuCl near the longitudinal exciton energy. The ratio of the intensity of the induced absorption from the lower-branch polariton to that from the upper-branch polariton was 0.8±0.2 near the longitudinal exciton energy and this value decreased with the increase of the excitation photon energy. These results can give a new approach to the determination of the additional boundary conditions.