Abstract
Strong optical Stark effect is shown to be observable as large splittings of the excitonic-molecular level in two-photon absorption spectrum, when the pump-field resonantly connects the polariton level to the excitonic molecule making the best use of the giant transition dipolemoment. The magnitude of the splitting is estimated to be 2 meV under the resonant pumping with pump-power 1 MW/cm 2 for CuCl crystal. We have also derived the effective Hamiltonian of the exciton and the excitonic molecule from the first principle to discuss the present nonlinear optical response.
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