1kHz飞秒激光脉冲在空气中传输成丝的演化过程  

Evolvement of filamentation of femtosecond laser pulses of a kHz repetition rate propagating in Air

作　　者：段作梁[1] 陈建平[1] 方宗豹[1] 王兴涛[1] 李儒新[1] 林礼煌[1] 徐至展[1] 

机构地区：[1]中国科学院上海光学精密机械研究所强光光学开放研究实验室,上海201800

出　　处：《物理学报》2004年第2期473-477,共5页Acta Physica Sinica

基　　金：国家自然科学基金 (批准是 :2 9890 2 10 );国家基础研究专项基金 (批准号 :G19990 75 2 0 0 );上海科技基金 (批准号 :0 15 9nm0 2 2 )资助的课题~~

摘　　要：利用高重复频率 (1kHz)、低能量的飞秒激光脉冲研究激光脉冲在空气中传输成丝的演化过程 .采用成像的方法观测飞秒激光脉冲在大气传输过程中光束截面上光强分布变化 ,以及大气等离子体通道对光强分布的反作用 .实验结果表明 ,激光脉冲在传输过程中先形成双丝结构 ,再逐渐合并成单丝结构 .In this paper the evolvement of the filamentation of femtosecond laser pulses propagating in air is studied experimentally.We observed the variation of light intensity in the beam profile and the interaction of the filament with the distribution of light intensity in the forming of the plasma filament by using imaging.The experimental results show that the laser pulse propagating in air first forms two filaments and then merges into a single filament.The numerical simulation using the nonlinear Schrdinger equation coupled to a multiphoton ionization law appears to describe several experimental results quite well.

关 键 词：飞秒激光脉冲 等离子体通道 传输成丝 光强分布 单丝结构 非线性薛定谔方程 大气光通信 

分 类 号：O432.12[机械工程—光学工程]