计算物理 ›› 2012, Vol. 29 ›› Issue (5): 775-780.

• 论文 • 上一篇    下一篇

开放Ⅴ型系统相对位相对LWI增益瞬态演化的影响

梁颖1, 王军2, 樊锡君1   

  1. 1. 山东师范大学物理与电子科学学院, 济南 250014;
    2. 山东师范大学附属中学, 济南 250014
  • 收稿日期:2011-10-01 修回日期:2012-01-18 出版日期:2012-09-25 发布日期:2012-09-25
  • 通讯作者: 樊锡君,E-mail:xjfanl08@yahoo.com.cn
  • 作者简介:梁颖(1986-),女,硕士生,主要从事量子光学研究.
  • 基金资助:
    国家自然科学基金(10875072)资助项目

Influence of Relative Phase on Transient Evolution of LWI Gain in an Open V-type System

LIANG Ying1, Wang Jun2, FAN Xijun1   

  1. 1. College of Physics and Electronics, Shandong Normal University, Jinan 250014, China;
    2. High School Attached to Shandong Normal University, Jinan 250014, China
  • Received:2011-10-01 Revised:2012-01-18 Online:2012-09-25 Published:2012-09-25

摘要: 数值计算具有自发辐射诱导相干性的开放V型三能级原子系统密度矩阵运动方程,分析无反转激光(LWI)增益的瞬态演化.结果表明:无论是否存在非相干抽运,探测场和驱动场间的相对位相(Ф)对增益的瞬态演化都有显著的影响;通过选择Ф的取值可以获得更大的瞬态和稳定增益;不存在非相干抽运时,系统达到瞬态增益最大值及获得增益稳定值所需要的时间更长,演化过程中振荡幅度更大,获得的增益更大;原子退出速率r0(原子注入速率比S)的变化将使增益瞬态演化的具体过程发生改变,在r0(S)的一定取值范围内,瞬态和稳定增益随S(r0)的增大而增大.

关键词: 开放系统, 瞬态演化, 相对位相, 无反转激光, 增益

Abstract: With numerical solution of density matrix motion equations of an open V-type three-level atomic system with spontaneously generated coherence,we analyze transient evolution of gain of lasing without inversion(LWI).It is shown that relative phase(Ф) between probe and driving fields has a significant effect on transient evolution of gain regardless of incoherent pump;Greater transient and steady gains can be obtained by selecting φ;As incoherent pump is absent,longer time is needed to get the greatest transient gain and steady gain.Oscillation amplitude in the evolution process is greater,and gain is also greater;Changing atomic exit rate r0(ratio of atomic injection rates S) leads to detail of gain transient evolution.In certain range of r0(S),transient and steady gains increase with S(r0).

Key words: open system, transient evolution, relative phase, lasing without inversion, gain

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