超短脉冲圆极化激光场的一阶修正描述及加速效应  

First-Order Correction Field of Circularly Polarized Ultra-Short Pulse and Its Acceleration Effect

作　　者：张绍银[1] 许长谭[1] 艾树涛[1] 

机构地区：[1]临沂师范学院物理系凝聚态物理研究所,山东临沂276005

出　　处：《光学学报》2009年第6期1586-1590,共5页Acta Optica Sinica

基　　金：国家自然科学基金(10076002);山东省自然科学基金(Y2007A01)资助课题

摘　　要：研究了超短脉冲圆极化激光场的一阶修正场,通过数值计算,探讨了入射电子的动力学特性,发现了超短脉冲圆极化激光场中的加速现象。通过研究电子的动力学特性与脉宽的关系发现,近轴近似方程在利用1/ω归一化后,脉宽τ0≤30时(ω为激光频率),仍然适用;而在脉宽τ0>30时,近轴近似方程与一阶修正方程的计算结果出现偏离。在事例功τ0=100和τ0=300中,采用一阶修正场方程,研究了电子束团的能量分布与空间分布的特征,发现在脉宽τ0=300的情况下,加速电子数目增多,而且电子束能够发生汇集。The first-order correction to the field of ultra-short circularly polarized laser was studied. This theory was used to study the dynamics characteristics of incident electron in the circularly polarized intense laser pulse field, and the acceleration phenomenon was found. For the pulse duration τo≤30, where 30 is normalized by 1/ω and ω is the laser frequency, the paraxial approximation is basically consistent with the first-order correction. But when τo〉30, the paraxial approximation deviates from the first-order correction. The electron bunch acceleration effect was also confirmed by using the first-order correction when τo = 100 and τo = 300. At last, the energy distribution spatial distribution and as to the pulse duration was obtained. It is also found that the amount of acceleration electrons increases and these electrons can gather under τo = 300.

关 键 词：激光技术 超短脉冲圆极化激光场 一阶修正 数值模拟 激光俘获加速机制 

分 类 号：O437[机械工程—光学工程]