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Physical Review A

Controlling dynamic instability of three-level atoms inside an optical ring cavity

Wenge Yang, Amitabh Joshi, Min Xiao

Published Sep 22, 2004• 19 citations
Publisher

Abstract

Dynamic instability in the transmission field of an optical ring cavity containing three-level $\ensuremath{\Lambda}$-type rubidium atoms is studied in detail both experimentally and theoretically. The onset and periodicity of such dynamic oscillations in the cavity field can be controlled by the experimental parameters, such as intensity and frequency detuning of the coupling field and∕or cavity field. Such nonlinear dynamic behavior is caused by competition between optical saturation of the cavity field and optical population pumping by the coupling field in the three-level atomic system.

DOI
10.1103/physreva.70.033807

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Summary form only given. The reduced absorption and enhanced nonlinearity in a three-level electromagnetically induced transparency (EIT) system are very important in achieving an effective all-optical switching action. The Kerr-nonlinear index of refraction of a three-level EIT medium can be greatly enhanced near resonance due to atomic coherence induced in such a system in comparison with a two-level atomic system, as we have shown by using an optical ring cavity. Both the magnitude and sign of the Kerr-nonlinear index change dramatically for different frequency detunings of the controlling (or coupling) or cavity (or probe) field. Bistability and dynamic instability occur when such a three-level /spl Lambda/-type EIT system is placed inside an optical ring cavity and the controlling and cavity input intensities to exceed certain threshold values. In this paper, we present a recent experimental demonstration of controlling the cavity output intensity by modulating the frequency detuning of the controlling beam.

Quantum Electronics and Laser Science Conference•Jun 25, 2003•0 citations
Dynamic instability in the transmission field of an optical ring cavity containing three-level \ensuremathΛ\ensuremath{\Lambda}\ensuremathΛ-type rubidium atoms is studied in detail both experimentally and theoretically. The onset and periodicity of such dynamic oscillations in the cavity field can be controlled by the experimental parameters, such as intensity and frequency detuning of the coupling field and∕or cavity field. Such nonlinear dynamic behavior is caused by competition between optical saturation of the cavity field and optical population pumping by the coupling field in the three-level atomic system.
Dynamic instability and chaos are experimentally observed in the output field of an optical cavity consisting of three-level atoms near the condition of electromagnetically induced transparency (EIT). The observed dynamic instability and route to chaos can be well controlled by the coupling laser field, and are greatly enhanced by the modified absorption, dispersion, and nonlinearity due to induced atomic coherence in the three-level atomic EIT system. A theoretical model is developed to quantitatively explain the observed results.
We have experimentally studied the optical bistable behavior in an optical ring cavity filled with a collection of three-level $\ensuremath{\Lambda}$-type rubidium atoms, interacting with two collinearly propagating laser beams. The bistability so observed is very sensitive to the induced atomic coherence in this electromagnetically induced transparency system or consequently to the altered nonlinearity in the system and, thus, can easily be controlled by changing the intensity and the frequency detuning of the coupling field.
Summary form only given. The reduced absorption and enhanced nonlinearity in a three-level electromagnetically induced transparency (EIT) system are very important in achieving an effective all-optical switching action. The Kerr-nonlinear index of refraction of a three-level EIT medium can be greatly enhanced near resonance due to atomic coherence induced in such a system in comparison with a two-level atomic system, as we have shown by using an optical ring cavity. Both the magnitude and sign of the Kerr-nonlinear index change dramatically for different frequency detunings of the controlling (or coupling) or cavity (or probe) field. Bistability and dynamic instability occur when such a three-level /spl Lambda/-type EIT system is placed inside an optical ring cavity and the controlling and cavity input intensities to exceed certain threshold values. In this paper, we present a recent experimental demonstration of controlling the cavity output intensity by modulating the frequency detuning of the controlling beam.