Polarization effect on critical power and luminescence in an air filament  

作　　者：刘畅 臧宏伟 李贺龙 于颜豪 徐淮良 

机构地区：[1]State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China

出　　处：《Chinese Optics Letters》2017年第12期1-5,共5页中国光学快报（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(Nos.61625501,61427816,and 61235003);the National Basic Research Program of China(No.2014CB921300);the Open Fund of the State Key Laboratory of High Field Laser Physics(SIOM);the Program for JLU Science and Technology Innovative Research Team(JLUSTIRT)(No.2017TD-21)

摘　　要：We demonstrate that the filamentation process is strongly influenced by the polarization state of the driver laser. When the laser polarization changes from linear to circular, the critical power for the self-focusing of a Ti：Sapphire laser （800 nm, 40 fs） in air increases from about 9.6 ± 1.0 to 14.9± 1.5 GW, while the second nonlinear refractive index n2 of air decreases from 9.9 × 10-2o to 6.4 ×10-20 cm2/W. We also demonstrate that the luminescence from the neutral nitrogen molecules at 337 nm is dependent on both the laser intensity and plasma density inside the filament.We demonstrate that the filamentation process is strongly influenced by the polarization state of the driver laser. When the laser polarization changes from linear to circular, the critical power for the self-focusing of a Ti：Sapphire laser （800 nm, 40 fs） in air increases from about 9.6 ± 1.0 to 14.9± 1.5 GW, while the second nonlinear refractive index n2 of air decreases from 9.9 × 10-2o to 6.4 ×10-20 cm2/W. We also demonstrate that the luminescence from the neutral nitrogen molecules at 337 nm is dependent on both the laser intensity and plasma density inside the filament.

关 键 词：Polarization effect on critical power and luminescence in an air filament 

分 类 号：O562[理学—原子与分子物理]