Nitrogen fluorescence induced by the femtosecond intense laser pulses in air

作     者：He Li Suyu Li Shuchang Li Dunli Liu Dan Tian Anmin Chen Ying Wang Xiaowei Wang Yunfeng Zhang Mingxing Jin 

作者机构：Institute of Atomic and Molecular PhysicsJilin University Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy (Jilin University) 

出 版 物：《High Power Laser Science and Engineering》 (高功率激光科学与工程（英文版）)

年 卷 期：2016年第4卷第1期

页      面：45-51页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 

基　　金：supported by the National Basic Research Program of China (No.2013CB922200) the National Natural Science Foundation of China (Nos.11474129,and 11504129) the Research Fund for the Doctoral Program of Higher Education (No.20130061110021) the Graduate Innovation Fund of Jilin University (No.2015091) 

主　　题：femtosecond laser filament fluorescence 

摘      要：Our experiments show that external focusing and initial laser energy strongly influences filament generated by the femtosecond Ti–sapphire laser in air. The experimental measurements show the filament length can be extended both by increasing the laser energy and focal length of focusing lens. On the other hand, the plasma fluorescence emission can be enhanced by increasing the laser energy with fixed focal length or decreasing the focal length. In addition, the collapse distance measured experimentally are larger than the calculated ones owing to the group-velocity-dispersion effect. In addition, we find that the line widths of the spectral lines from N2 is independent of filament positions, laser energies and external focusing.