激光脉冲的量子整形与相干控制-陕西师范大学学报期刊社网站

陕西师范大学学报（自然科学版）

物理学

激光脉冲的量子整形与相干控制

阿布力米提·吾买尔，任立庆，张敏华，许康，李永放*

(陕西师范大学物理学与信息技术学院，陕西西安 710062)

阿布力米提·吾买尔，男，硕士研究生，研究方向为量子光学.* 通讯作者：李永放，男，教授，博士研究生导师.E-mail：yfli@snnu.edu.cn.

摘要:

研究了小激光脉冲面积光场与三能级原子系统的相互作用过程，分析了整形脉冲的形成机理与特征，讨论了能级弛豫以及整形介质长度等参量对输出光场的影响.依据色散理论,分析了瞬态双光子跃迁几率的振荡现象.结果表明：随着介质长度(l)、频宽(Δω)和弛豫时间(t2)等参量的变化，瞬态双光子跃迁几率发生有规律的变化，同时出现跃迁几率的瞬时振荡现象.

关键词：

激光脉冲，双光子跃迁，量子整形，相干控制

收稿日期：

2009-10-15

中图分类号：

O431.2

文献标识码：

文章编号：

1672-4291(2011)01-0027-06

基金项目：

陕西省自然科学基金资助项目(2007A04)；陕西师范大学优秀博士论文基金资助项目(X2009YB09).

Doi:

Coherent control and quantum shaping with the laser pulse

Abulimiti·Wumaier, REN Li-qing, ZHANG Min-hua, XU Kang, LI Yong-fang*

(College of Physics and Information Technology, Shaanxi Normal University, Xi′an 710062, Shaanxi, China)

Abstract:

The interaction between the laser pulse with a small-area and a three-level atomic system is investigated. The formation and characterization of the shaped laser pulse are analyzed and the two-photon transition is studied with the shaped laser pulse. The influence of the relaxation of the excited state and the length of the shaping medium on the two-photon absorption is discussed. Based on the dispersion theory the oscillation of the transient two-photon transition is explained. The result indicates that the transition probability of two-photon absorption evolves regularly with the several values of parameters such as the length of medium (l), relaxation time (t2) and bandwidth (Δω). Meanwhile the transition probability appears in the transient oscillation.

KeyWords:

laser pulse; two-photon transition; quantum shaping; coherent control.