摘要
Spatial characterization of a femtosecond laser pulse filament in air is experimentally investigated by detecting the optical emission spectroscopy of laser-induced plasmas.It is shown that the intensity of N I spectral lines have different angular distributions along the filament and the calculated results fit the experimental data well.The obtained degree of atomic polarization along the filament strongly depends on the electron density and the propagation characteristic of the femtosecond laser pulse.
作者
孙少华
刘小亮
刘作业
王小山
丁鹏基
情操
郭泽钦
胡碧涛
SUN Shao-Hua;LIU Xiao-Liang;LIU Zuo-Ye;WANG Xiao-Shan;DING Peng-Ji;LIU Qing-Cao;GUO Ze-Qin;HU Bi-Tao(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000)
基金
the National Natural Science Foundation of China under Grant Nos 11135002,11075069,91026021,11075068 and 10975065.