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Journal of Physics Conference Series

Light controlling light in a coupled cavity-atom system

Bichen Zou, Zheng Tan, Yifu Zhu

Published Apr 9, 2014• 1 citation
Publisher

Abstract

We present a theoretical model of light controlling light in a multi-atom cavity QED system consisting of three-level atoms confined in a cavity and interacting with a control laser from free space. A signal laser is coupled into the cavity and provides two output light channels: the transmitted signal light through the cavity and the reflected signal light from the cavity. We show that with the cavity electromagnetically induced transparency manifested by the free-space control light, the amplitude and the phase of the intra-cavity signal light can be manipulated by the free-space control laser. We analyze the cavity transmitted signal light and the cavity reflected signal light, and show that the two output channels of the signal light are complementary and the cavity-atom system is a versatile system for studies of all-optical switching and cross-phase modulation at low control intensities.

DOI
10.1088/1742-6596/497/1/012007

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We report an experimental observation of all-optical switching in a cavity QED system consisting of multiple three-level atoms confined in a cavity mode. A signal light is coupled into the normal mode of the cavity-atom system and its transmission through the cavity is switched on or off by a control laser coupled to the atoms from free space. Our experiment shows that the all-optical switching in the cavity QED system can be performed for the cavity mode tuned on resonance with or off resonance from the atomic transition frequency.