四能级Λ-型原子系统中自发诱导相干对无反转激光的效应  

Effects of spontaneously induced coherence on laser without population inversion in a four-level Λ-type system

作　　者：韩定安[1] 曾亚光[1] 陈伟成[1] 

机构地区：[1]佛山科学技术学院光电子与物理学系,广东佛山528000

出　　处：《佛山科学技术学院学报（自然科学版）》2007年第2期21-25,共5页Journal of Foshan University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10547108)

摘　　要：讨论了四能级Λ-型原子系统自发诱导相干(SGC)对原子系统产生无反转激光的影响。原子系统在与一个弱探测光场及强泵浦光场共振相互作用情况下,不论是否双光子共振,原子系统都有无反转激光(LWI)产生。在双光子共振条件下,SGC效应可强化LWI的产生;在非双光子共振时,改变SGC参量和上能级之间能级差可有效控制LWI的产生及其产生的强度。文中给出了产生LWI的相应条件。The coherence of a four-level Λ-type system with spontaneously generated coherence （SGC） is studied. With a weak probe and a strong coupling fields, whether the atomic system is on two-photon resonance or not, there is light without population inversion （LWI） on the probe field. On two-photon resonance, LWI is strengthened by SGC. On non-two-photon resonance, LWI can he controlled simply by adjusting the parameter of SGC and the two-upper-level separation. Meanwhile, the analytical solutions to the SGC parameter where LWI occurs are given in both cases.

关 键 词：四能级Λ-型原子系统 自发诱导相干 双光子共振 无反转激光 

分 类 号：O431.2[机械工程—光学工程]