Broadening of Excitonic Molecule State under the Giant Two-Photon Excitation in CuCl

Abstract

Origin of the broadening and asymmetry of the giant two-photon absorption (GTA) band for the direct generation of excitonic molecules (EM) is investigated through the measurement of the induced circular dichroism and depolarization of a transmitted laser light resonated around the GTA peak. The plausible origin is suggested to be ascribed to the broadening of the EM state caused by the collision between EM and excitonic polariton both created resonantly with the GTA.