阿秒极化拍的V型三能级对称二阶相干理论  

V type three-level symmetric second-order coherence theory of attosecond polarization beats

作　　者：甘琛利 张彦鹏[2] 冯宇[2] 余孝军[2] 汪杰[2] 李创社[2] 宋建平[2] 卢克清[3] 侯洵[2] 

机构地区：[1]西安市农业学校,西安710077 [2]西安交通大学电子科学与技术系,西安710049 [3]中国科学院西安光学精密机械研究所瞬态光学技术国家重点实验室,西安710068

出　　处：《物理学报》2005年第2期726-735,共10页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :60 3 0 80 0 2 ) ;全国博士学位论文作者专项资金 (批准号 :2 0 0 3 3 9)资助的课题~~

摘　　要：基于两单光子过程的相位共轭二阶极化干涉 ,从理论上研究了V型三能级系统在阿秒量级的对称和频极化拍频 (SFPB) ,考虑了抽运光束为窄带线宽或宽带线宽的情形 ,发现测得的信号对任意带宽的马可夫随机光场的统计特征非常敏感 ,其在测量偶极禁界跃迁两激发态之间的能级和时并不受激光线宽的限制 ,仅取决于光学跃迁均匀增宽 ,而且可以得到消除多普勒增宽的测量精度 .在窄带情形下 ,场关联对SFPB信号影响很弱 .在宽带情形下 ,SFPB信号表现出共振 非共振交叉关联 .SFPB作为一种阿秒超快调制过程 ,从理论上说它可以扩展到任何和频能级系统 .Based on the phase-conjugate polarization interference between two one-photon processes, we have studied theoretically the symmetric sum-frequency polarization beat (SFPB) of V type three-level system in attosecond scale in the case of arbitrary bandwidth or broadband linewidth laser. The homodyne detected SFPB signal is shown to be particularly sensitive to the statistical properties of the Markovian stochastic light fields with arbitrary bandwidth. We have found that the accuracy in the measurement of the energy-level sum of two excited states which are dipolar forbidden transition to each other is determined by the homogeneous linewidths of the optical transitions and exceeds the laser linewidth. A Doppler-free precision in the measurement of the energy-level sum can be achieved with an arbitrary bandwidth. The field correlation has weakly influence on the SFPB signal when the laser has a narrow bandwidth. When the laser has a broadband linewidth, the SFPB signal shows resonant-nonresonant cross correlation. As an attosecond ultrafast modulation process, SFPB can be extended intrinsically to any sum-frequency of energy-levels.

关 键 词：能级 二阶 阿秒 非共振 对称 跃迁 激发态 极化 线宽 信号 

分 类 号：O572.31[理学—粒子物理与原子核物理]