静态光脉冲寿命的研究

The stationary light pulse based on electromagnetically induced transparency is very promising for few-photon nonlinear optics and quantum information processing. With the zero group velocity, the stationary light pulse can significantly increase the interaction time between the media and the light; therefore, the light-time of the stationary light pulse becomes a very important property. In this project, we will focus on the stationary light pulse in the Rb vapor, Pr:YSO and N-V center crystals. The specific content as follows:.1) Find the proper models of three-level Lambda system ( and four-level double Lambda system) that include the inhomogeneous broadenings of the solid and the Doppler broadening of the Rb vapor, to investigate the dominant factors that determine the life-time of the stationary light pulse; Especially the effect of the Doppler broadenings..2) Give the detailed analysis on the dynamics of general process of the stationary light pulse; and discuss how the power instability, laser jitter, and the speed of switching the coupling fields on that impact on the life-time of the stationary light pulse.

基于量子相干效应的静态光脉冲现象对于弱光非线性和量子信息科学有重要的应用价值。这种群速度为零的光脉冲延长了光与物质的相互作用时间，因而使得静态光脉冲的寿命成为其重要的属性。本项目中我们分别以铷蒸汽，Pr:YSO晶体以及N-V色心晶体为介质，开展关于静态光脉冲寿命的理论研究。具体内容是：.1）建立适合描述多普勒加宽以及固体非均匀展宽的理论模型。利用三能级Lambda模型以及四能级双Lambda模型分析影响静态光脉冲寿命的决定性因素；讨论非均匀加宽机制（重点为多普勒加宽）对静态脉冲寿命的影响。.2）详细分析静态光脉冲形成过程中的动力学原理，并对耦合场强度不稳，频率漂移，以及开启速度对静态光脉冲寿命的影响进行讨论。

基于电磁感应光透明效应 (EIT) 的静态光现象(SLP)在弱光非线性和量子信息科学等领域有重要的应用价值。这种群速度为零的光脉冲可用于延长光与物质的相互作用时间，因而静态光的寿命是一个重要的属性。由于驻波场驱动的EIT介质中存在的反射现象与静态光是基于同一原理的, 使得这种反射现象的反射率可以作为一种 “参照” 来对静态光的寿命进行研究. 在报告中, 我们分析了反射率和静态光寿命的相关性. 并以Rb87原子中的四能级双 Lambda 系统为例, 分析了不同的能级选择对反射率和静态光寿命的影响，进而说明了长寿命的静态光对能级的要求。