开放四能级系统中自发辐射诱导相干  

Spontaneously Generated Coherence in an Open Four-level Atomic System

作　　者：卜凡阁[1] 李爱云[1] 乔红霞[1] 杜军[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,山东济南250014 [2]山东师范大学传播学院,山东济南250014

出　　处：《光电子．激光》2007年第8期1008-1012,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(10675076);山东省自然科学基金资助项目(2006A21)

摘　　要：首先提出了开放的准Λ型四能级原子系统模型,然后利用系统定态数值解从不同方面研究了自发辐射诱导相干(SGC)对无反转激光(LWI)增益的影响。研究结果表明:通过调节SGC的强弱可实现从吸收到LWI的转换,并显著提高LWI增益;表示SGC效应的2个因子p1和p2的变化对LWI增益的影响程度有较大的差别;开放系统可得到远大于相应封闭系统的LWI增益,在无泵浦场情况下的开放系统仍然可以得到探测场的无反转放大,而相应封闭系统只能呈现对探测场的吸收。We put forward a model of an open quasi A-type four-level atomic system,and then investigate the effect of spontaneously generated coherence（SGC） on the gain of lasing without inversion from different respects by using the numerical calculation results of the system in the steady state. The study results show that, the switch/ng from absorption to lasing without inversion（LWI） and the enhancement of the LWI gain can be realized by adjusting the strength of SGC;the variety of the two factors p1 to p2 which represent the SGC effect will produce remarkable different influence on the LWI gain. We also find that,the LWI gain is much larger in open system than that in the corresponding closed system;moreover,when the incoherent pump field is absent,the LWI gain can be obtained in the open system but can＇t in the closed system.

关 键 词：四能级 开放 自发辐射诱导相干(SGC) 增益 无反转激光(LWI) 

分 类 号：O431.2[机械工程—光学工程]