电子在强聚焦激光场中的动力学轨道  

The Dynamic Trajectories of Electron in the Tightly-focused Intense Laser Field

作　　者：张绍银[1] 霍裕昆[2] 许长谭[3] 

机构地区：[1]山东临沂师范学院凝聚态物理研究所,山东临沂276005 [2]复旦大学现代物理研究所,上海200433 [3]山西大学物理电子工程学院,山西太原030006

出　　处：《量子光学学报》2006年第2期120-124,共5页Journal of Quantum Optics

基　　金：国家自然科学基金(10076002);国家高科技惯性约束聚变基金(10335030);中国工程物理研究院科学基金和国家重点基础研究发展规划(NKBRF)(1999075200)

摘　　要：模拟研究了具有一定初态能量的相对论电子在强聚焦激光场中的动力学特性,发现激光场强达a0=eE/mecω5,有三种典型的动力学轨道:电子俘获加速轨道CAS(Capture&Acceleration Scenario),非弹性散射轨道IS(Inelastic Scattering),电子穿进轨道PARM(Penetrate into Axial Region and Move)。发现穿进轨道PARM的出现强烈依赖于腰宽w0,在腰宽较小(激光腰宽w0 30)时较明显,其出现与紧聚焦激光场衍射效应较强有关。在腰宽较小时,随着脉冲长度的减小,PARM的出现概率减小,而IS的出现概率增大。本文探讨了三种轨道物理机制的区别。为聚焦激光场加速电子提供参考。The paper studies the dynamic characteristics of relativistic electron injected into intense vacuum laser fields. The authors find the dynamic trajectories can basically be classified into three categories, namely IS （ Inelastic Scattering）, CAS （Capture and Acceleration Scenario） and PARM （Penetrate into Axial Region and Move） trajectory. The physical mechanisms of the three kinds of electrons have been examined. In particular, the PARM trajectory which this paper presents is different from the CAS and IS trajectones which can be found in authors＇ previous work. The paper shows that the PARM stems from the strong diffraction effect of a tightly-focused laser field. In addition, the length of pulse for the three kinds of electrons to emerge are investigated. This paper is helpful for designing experiments to test the CAS scheme.

关 键 词：激光与电子的相互作用 电子轨道 激光场衍射效应 

分 类 号：O431[机械工程—光学工程]