Cavity-Induced Optical Nonreciprocity Based on Degenerate Two-Level Atoms

Author:

Qi Chuan-Zhao1,Zheng Jia-Rui1,Tong Yuan-Hang1,Li Ruo-Nan2,Wang Dan23,Huang Liang-Hui23ORCID,Zhou Hai-Tao123ORCID

Affiliation:

1. Sanli Honors College, Shanxi University, Taiyuan 030006, China

2. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, School of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China

3. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

Abstract

We developed and experimentally realized a scheme of optical nonreciprocity (ONR) by using degenerate two-level atoms embedded in an optical ring cavity. For the degenerate transition Fg = 4 ↔ Fe = 3, we first studied the cavity-transmission property in different coupling field configurations and verified that under the strong-coupling regime, the single-dark-state peak formed by electromagnetically induced transparency (EIT) showed ONR. The stable ground-state Zeeman coherence for Λ-chains involved in the degenerate two-level system was found to be important in the formation of intracavity EIT. However, different from the three-level atom–cavity system, in the degenerate two-level system, the ONR effect based on intracavity EIT occurred only at a low probe intensity, because the cavity–atom coupling strength was weakened in the counter-propagating probe and coupling field configuration. Furthermore, ONR transmission with a high contrast and linewidth-narrowing was experimentally demonstrated.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Shanxi Province, China

the Fund for Shanxi Key Subjects Construction

Publisher

MDPI AG

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