相对论飞秒激光脉冲在真空中对预加速电子的加速  

Acceleration of a pre-accelerated electron by an ultra-short and ultra-intense laser pulse in vacuum

作　　者：何峰[1,2] 余玮[2] 徐涵[2] 陆培祥[1,2] 

机构地区：[1]激光技术国家重点实验室,华中科技大学,武汉430074 [2]中国科学院上海光学精密机械研究所强光光学实验室,上海201800

出　　处：《物理学报》2005年第9期4203-4207,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10375083);国家重点基础研究专项基金(批准号:TG1999075206_2)资助的课题.~~

摘　　要：通过求解电子运动的相对论方程,发现预加速电子在超强超短激光脉冲的作用下可以获得很高的能量增益.飞秒激光脉冲的上升沿在焦点附近的区域有效加速电子后,电子和光脉冲一起传播一段距离(远大于瑞利长度)后,激光强度变得很弱,从而使脉冲下降沿对电子的减速作用可以忽略不计,因此电子只经历加速过程而没有被减速,当电子和光脉冲分离时,电子获得了很高的能量增益.当光强为1019W/cm2,电子的初始能量为MeV量级时,电子的能量增益可以达到0.1GeV.进一步讨论了电子的能量增益与电子的初始条件与激光脉冲的参数之间的关系.Acceleration of a pre-accelerated electron by an ultra-short and ultra-intense laser pulse in vacuum has been explored. The deceleration by the descending part of the laser pulse can be neglected when the pre-accelerated electron is accelerated by the ascending part of the pulse. Because the acceleration distance is much longer than for a initially stationary electron, the energy gain is much larger. The net energy gain can be up to 0.1GeV with a laser intensity of 10^19W/cm^2 and an initial electron energy of 4.5MeV. Final energy gain of the electron as a function of its initial condition and laser parameters has also been discussed.

关 键 词：电子加速 飞秒激光脉冲 能量增益 飞秒激光脉冲 电子运动 加速过程 相对论 真空 超短激光脉冲 激光强度 瑞利长度 

分 类 号：TN24[电子电信—物理电子学] TN241