非旋波近似下二能级原子与频率变化光场作用的量子特性  

Quantum Properties of Two-Level Atoms Interacting with FrequencyVarying Light Fields Under Non-Rotating-Wave Approximation

作　　者：丛红璐[1] 任学藻[2] Cong Honglu;Ren Xuezao(Haibin College, Beijing Jiaotong University, Huanghua, Hebei 061199, China;School of Science, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China)

机构地区：[1]北京交通大学海滨学院,河北黄骅061199 [2]西南科技大学理学院,四川绵阳621010

出　　处：《光学学报》2018年第4期324-329,共6页Acta Optica Sinica

基　　金：教育部高等学校物理类专业教学指导委员会力学教学改革项目(JZW-16-LX-07);河北省高等学校科学技术研究青年基金(QN2017401);河北省创新能力提升计划软科学研究及科普专项(17K55304D);河北省高校精品在线开放课程建设项目;河北省实验教学示范中心建设项目;北京交通大学海滨学院教科研项目

摘　　要：在非旋波近似下,研究了频率随时间变化的相干态光场与二能级原子的相互作用,讨论了光场频率随时间作正弦和方波变化时,原子布居数反转随时间的演化特性。数值计算结果表明,当光场频率不随时间变化时,原子布居数反转的周期随着平均光子数的增大而增大;当光场频率随时间作正弦变化时,原子布居数反转塌缩回复的周期和振幅受到了很大影响,光场频率对演化曲线的振荡频率起到了调制作用;当光场频率随时间作方波变化时,原子布居数反转塌缩回复的周期发生了改变,而且出现了新的塌缩回复现象。The interaction between a coherent state light field with time-varying frequency and two-level atoms is investigated under non-rotating-wave approximation.The time evolution of the atomic population inversion is discussed when the field frequency changes with time in a sine or a square wave way.The numerical results indicate that,when the light field frequency does not change with time,the period of atomic population inversion increases with the increase of the mean photon number.When the field frequency changes with time in a sine wave way,the collapse-revival period and the amplitude of atomic population inversion are strongly affected,and the frequency of the light field plays a modulation role in the oscillation frequency of evolution curves.When the field frequency changes with time in a square wave way,the collapse-revival period of the atomic population inversion changes and a new collapse-revival phenomenon emerges.

关 键 词：量子光学 二能级原子 非旋波近似 原子布居数反转 

分 类 号：O431.2[机械工程—光学工程]