Absorption Changes Induced by Off-Resonance Driving a Degenerate Two-Level System  

作　　者：蔡瑾 周海涛 王文琦 李中华 李涛 张俊香 

机构地区：[1]The State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006

出　　处：《Chinese Physics Letters》2008年第6期2041-2044,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation under Grant No 10674089, NSFC/RGC Joint Research Scheme （No 60518001）, and the National Basic Research Programme of China under Grant No 2006CB921101.

摘　　要：The alteration of atomic absorption via quantum coherence is observed in the degenerate two-level atomic system. It is shown that when the detuning of coupling field equals to that of probe light, i.e. two-photon resonance, the reduction of atomic absorption via electromagnetically induced transparency occurs. However, when we tune the coupling field to two-photon off-resonance, the enhancement of absorption is obtained for the probe field. The influences of one-photon detuning and intensity of coupling field on absorption are also experimentally demonstrated.The alteration of atomic absorption via quantum coherence is observed in the degenerate two-level atomic system. It is shown that when the detuning of coupling field equals to that of probe light, i.e. two-photon resonance, the reduction of atomic absorption via electromagnetically induced transparency occurs. However, when we tune the coupling field to two-photon off-resonance, the enhancement of absorption is obtained for the probe field. The influences of one-photon detuning and intensity of coupling field on absorption are also experimentally demonstrated.

关 键 词：ELECTROMAGNETICALLY INDUCED ABSORPTION TRANSPARENCY TRANSITIONS VAPOR 

分 类 号：O562[理学—原子与分子物理]