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Journal of Nonlinear Optical Physics & Materials

Nonlinear Susceptibilities in a Three-Level Atomic System

Nadeem A. Ansari, R.A. Sammut

Published Sep 1, 1997• 0 citations
Publisher

Abstract

We have studied the effect of the propagation of two strong fields of different frequencies on the nonlinear susceptibility in a medium composed of identical stationary three-level atoms in V-configuration. In particular, we show that each field influences the steady-state susceptibility, absorption and refractive-index change experienced by the other field. At large field strengths of one field, the second field experiences less absorption and an enhanced refractive index change.

DOI
10.1142/s0218863597000253

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We have studied the effect of the propagation of two strong fields of different frequencies on the nonlinear susceptibility in a medium composed of identical stationary three-level atoms in V-configuration. In particular, we show that each field influences the steady-state susceptibility, absorption and refractive-index change experienced by the other field. At large field strengths of one field, the second field experiences less absorption and an enhanced refractive index change.
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Refractive index and absorption experienced by a probe field propagating through a three-level atomic medium can be effectively manipulated by the bistable behavior of a control field. The probe field couples the lower transition of the atom in a ladder configuration and experiences normal or anomalous dispersion depending on the control field being in the upper or lower bistable state, respectively. We also obtain nonlinear dynamical instability in the form of periodic self-pulsing as the lower bistable branch becomes unstable, quite unlike earlier demonstrations of an unstable regime in the upper branch. Consequently, the susceptibility experienced by the probe field varies periodically in time as dictated by the control field self-pulsing.