自发产生相干对探测场的色散和吸收影响  

Effect of spontaneously generated coherence on absorption and dispersion in probe laser

作　　者：严祥安[1] 宋建平[1] 尹宝银[1] 蒋文娟[1] 郑淮斌[1] 张彦鹏[1] 

机构地区：[1]西安交通大学电子物理与器件教育部重点实验室

出　　处：《物理学报》2008年第6期3538-3542,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60678005);高等学校博士学科点专项科研基金(批准号:20050698017);霍英东教育基金会高等院校青年教育基金(批准号:106061)资助的课题~~

摘　　要：在Y形四能级原子系统中,分析了自发产生相干对探测场的色散和吸收影响.结果发现,随着自发产生相干的增强,系统呈现的电磁感应透明窗口逐渐变窄,并在共振处出现反常色散,吸收从负值变为正值.同时,当抽运场和耦合场的相对强度不同时,共振处附近吸收为零或出现增益,而两场强相等或接近时,系统对探测场表现为吸收.A theoretical investigation is carried into the effect of spontaneously generated coherence on absorption and dispersion in probe laser of Y-type atom system. It is found that the electromagnetically induce transparency window in the system narrows gradually as the spontaneously generated coherence intensifies. Moreover, the anomalous dispersion appears and the absorption changes from negative value to positive valve at resonance. At the same time, the absorption is zero or negative near resonance when the relative strength of the coupling field and pump field are different, and the atomic medium shows positive absorption when the two fields are exattly or nearly equal and close.

关 键 词：非线性光学 电磁感应透明 自发产生相干 

分 类 号：O437[机械工程—光学工程]