Laser Mode-Dependent Size of Plasma Zones Induced by Femtosecond Laser Pulses in Fused Silica  

作　　者：汤善春 蒋红兵 刘一 龚旗煌 

机构地区：[1]State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871

出　　处：《Chinese Physics Letters》2008年第9期3268-3271,共4页中国物理快报（英文版）

基　　金：Supported by the National Basic Research Programme of China under Grant No 2006CB806007, the National Natural Science Foundation of China under Grant Nos 10574006, 10634020 and 10521002, and the New Century Excellent Talent （NCET） Project of the Ministry of Education of China.

摘　　要：We carry out the numerical simulations of femtosecond laser propagation with TEMoo mode, TEM10 mode and a beam combining both the modes in fused silica. It is found that the transverse size of plasma zones induced by laser pulses with the TEM10 mode is smaller than that induced by the TEM00 mode, while the longitudinal size is almost the same, and the saturated plasma density is higher. The transverse size, the longitudinal size and the ratio of the longitudinal to transverse size, for the beam combining both the modes, all could be reduced at the same time in comparison with the TEM00 mode under the same focusing conditions.We carry out the numerical simulations of femtosecond laser propagation with TEMoo mode, TEM10 mode and a beam combining both the modes in fused silica. It is found that the transverse size of plasma zones induced by laser pulses with the TEM10 mode is smaller than that induced by the TEM00 mode, while the longitudinal size is almost the same, and the saturated plasma density is higher. The transverse size, the longitudinal size and the ratio of the longitudinal to transverse size, for the beam combining both the modes, all could be reduced at the same time in comparison with the TEM00 mode under the same focusing conditions.

关 键 词：the power-law exponents precipitation durative abrupt precipitation change 

分 类 号：TN24[电子电信—物理电子学]