在缀饰场中四能级“Ladder”系统的布局数转移(英文)  

Population transfer in four-level ladder system assisted by dressing fields

作　　者：张瑞州[1] 李小红[1] 张现周[2] 

机构地区：[1]河南科技大学理学院,洛阳471003 [2]河南师范大学物理工程与信息学院,新乡453007

出　　处：《原子与分子物理学报》2008年第3期711-715,共5页Journal of Atomic and Molecular Physics

基　　金：河南省自然科学基金(2004601107)

摘　　要：利用"反直觉"频率啁啾激光脉冲分析了偶能级ladder系统的布局数迁移,其中在缀饰激光场作用下N-2个中间态进行耦合.作为偶能级ladder系统的代表,我们着重分析了四能级ladder系统.研究发现如果缀饰激光场足够强且发生共振,则在能级1和能级4之间发生完全布局数迁移必须要求有一个恰当的脉冲叠加面积.调谐pump激光和stokes激光,使其中一个缀饰中间态发生共振,则可以使这个四能级系统简化为三能级系统.Even-N-level ladder system has been analyzed for population transfer by counterintuitive frequencychirped laser pulse, in which N- 2 intermediate states are strongly coupled by dressing laser field. The specific analysis for the four-level ladder system has been carried out by using a dressed-state picture, as representative for even-N-system. It is found that a well-controlled pulse area is required for complete population transfer from ｜ 1〉←→｜4〉if the dressing field is sufficiently strong and on resonance. And it is essential to detune the pump and Stokes laser so that one of the dressed intermediate states is on resonance, leading to the reduetion of the whole system to the three-level system.

关 键 词：布局数迁移 激光脉冲 缀饰场 旋转波近似 

分 类 号：O562.1[理学—原子与分子物理]