光学学报, 2004, 24 (4): 563, 网络出版: 2006-06-12
Y型四能级中的双电磁感应透明和超窄吸收
Double Electromagnetically Induced Transparency and Ultra-Narrow Line Width in Y-Type Energy Level System
量子光学 量子干涉 双暗态共振 双电磁感应透明 超窄线宽 quantum optics quantum interference double dark resonance double electromagnetically induced transparency ultra-narrow line width
摘要
采用密度矩阵方程,对双光场耦合的分子Y型四能级系统的粒子数分布和吸收特性进行了计算和分析,在此能级系统中得到了双暗态共振和双电磁感应透明,并讨论了相应的物理机制。同时,我们讨论了Y型四能级两个上能级的自发辐射产生的量子干涉效应对电磁感应透明的影响,发现自发辐射干涉相消可以产生超窄线宽和导致探测光的吸收增强,自发辐射干涉相长可以展宽谱线和减弱探测光的吸收,并运用缀饰态理论对以上计算结果进行分析,与采用密度矩阵方程的计算结果一致。
Abstract
Using matrix equation, the population distribution and absorption characteristics in the molecular Y-type energy level system with two driving fields are calculated and analyzed. The generation of double dark resonance and double electromagnatically induced transparency in this energy level system is obtained, its physical mechanism is discussed. The effect of the quantum interference of the spontaneous emission on the electromagnetically induced transparency are also discussed. Coherence cancellation of the spontaneous emission can form the ultra-narrow line width and enhance the absorption, whereas the coherence enhancement of the spontaneous emission can form the wide absorption line width and weaken its intensity, above calculated results are analyzed with the dressed state theory and agree with those by the density matrix equation.
张衍亮, 张循利, 孙真荣, 丁良恩, 王祖赓. Y型四能级中的双电磁感应透明和超窄吸收[J]. 光学学报, 2004, 24(4): 563. 张衍亮, 张循利, 孙真荣, 丁良恩, 王祖赓. Double Electromagnetically Induced Transparency and Ultra-Narrow Line Width in Y-Type Energy Level System[J]. Acta Optica Sinica, 2004, 24(4): 563.