Y型四能级系统中相对位相对探测场的影响  

Effect of Relative Phase on Probe of Y-Type Four-Level System

作　　者：王祥伟[1] 张向阳[1] 

机构地区：[1]江南大学理学院,江苏无锡214122

出　　处：《江南大学学报（自然科学版）》2009年第6期740-745,共6页Joural of Jiangnan University (Natural Science Edition)　

摘　　要：运用密度矩阵方程理论,在自发辐射诱导相干(SGC效应)的条件下,研究了Y型四能级系统中相干光场之间的位相差对探测光场的吸收和色散性质的影响。数值模拟结果表明,通过对相对位相的控制,可以实现探测光场的吸收(增益)和色散成周期性的放大和减弱。在适当的参数取值下,相对位相为=α时的色散曲线与=α+π/2时的吸收(增益)曲线类似;当变化π时,系统色散曲线会发生反转,系统呈现光学双稳效应,这对量子逻辑门的研究有着重要的理论意义。Based on matrix theory, the absorption and dispersion properties of Ф Y-type four-level system driven by three coherent fields are investigated on the condition of effect spontaneously induced coherence. The result obtained by means of numerical method indicates that by adjusting the relative phase of the coherent field in the steady state, the dispersion （gain） and dispersion of the probe field can be significantly magnified and weakened periodically. Using appropriately parameters, the dispersion curve corresponding to Ф = α is similar to the absorption （gain） curve corresponding to Ф=α＋π/2. Iri addition, the evolution of dispersion with the relative phase of coherent fields shows explicitly optical bistability.

关 键 词：自发辐射诱导相干 相对位相 吸收性质 色散性质 光学双稳 

分 类 号：O431[机械工程—光学工程]