自发辐射诱导相干对开放的Ladder型系统无反转激光增益瞬态演化的影响  

Effect of spontaneously generated coherence on transient evolution of LWI gain in an open Ladder type system

作　　者：杨艳玲[1] 王蕾[1] 刘中波[1] 卢洪武[2] 樊锡君[1] 

机构地区：[1]山东师范大学物理与电子科学学院,济南250014 [2]山东师范大学传播学院,济南250014

出　　处：《物理学报》2009年第5期3161-3165,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10675076);山东省自然科学基金(批准号:2006A21)资助的课题~~

摘　　要：利用开放的Ladder型三能级原子系统密度矩阵运动方程的数值解,研究了在探测场和驱动场双共振条件下,自发辐射诱导相干(SGC)对系统无反转激光(LWI)增益瞬态演化的影响以及注入速率比和退出速率对与SGC相关的增益的调制作用.研究结果表明:SGC强度的变化将使瞬态增益和最终的稳定增益发生显著的改变;存在非相干抽运时,LWI增益随注入速率比和退出速率的减小而增大,而不存在非相干抽运时的情况与此正好相反;通过选取适当的SGC强度、注入速率比和退出速率可得到最大的LWI增益的瞬态值和最终的稳定值.The effect of spontaneously generated coherence （SGC） on transient evolution of gain of lasing without inversion （LWI） and modulation roles of the injection rate ratio and exit rate on SGC-dependent gain in an open Ladder type three level system are studied by using the numerical solution of the density matrix motion equation of the system. It was shown that ： variation of SGC strength will make the transient and final stationary gains having a considerable changing; when incoherent pumping presents, LWI gain increases with the ratio of injection rates and exit rate decreasing, however, when incoherent pumping is absent, the case is just the opposite; by choosing suitable values of SGC strength, the injection rate ratio and exit rate, we can obtain the largest transient and final stationary gain.

关 键 词：开放系统 自发辐射诱导相干 瞬态演化 无反转增益 

分 类 号：O431.2[机械工程—光学工程] TN248.3[理学—光学]