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Moscow University Computational Mathematics and Cybernetics

Mathematical modeling of optical bistability on the basis of a light-induced electric field

Svetlana A. Varentsova, M.M. Loginova, V.A. Trofimov

Published Jan 1, 2003• 1 citation
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Using computer simulation, the feasibility of absorption optical bistability based on the dependence of the absorption coefficient on an electric field induced by a high-intensity laser pulse acting on a semiconductor and shifting the energy levels of atoms is demonstrated. Unlike the known mechanisms behind absorption optical bistability, here enhanced diffusion of charged particles does not change the rate of switching the system from the lower to upper state. Radiation-semiconductor interaction conditions are found when, after being switched to the upper state, the system remains in it until the laser pulse disappears.
We investigate the phenomenon of optical bistability in a driven ensemble of Rydberg atoms. By performing two experiments with thermal vapors of rubidium and cesium, we are able to shed light on the underlying interaction mechanisms causing such a nonlinear behavior. Due to the different properties of these two atomic species, we conclude that the large polarizability of Rydberg states in combination with electric fields of spontaneously ionized Rydberg atoms is the relevant interaction mechanism. In the case of rubidium, we directly measure the electric field in a bistable situation via two-species spectroscopy. In cesium, we make use of the different sign of the polarizability for different lll states and the possibility of applying electric fields. Both these experiments allow us to rule out dipole-dipole interactions and support our hypothesis of a charge-induced bistability.