Acoustic Diagnostics of Plasma Channels Induced by Intense Femtosecond Laser Pulses in Air
HAO Zuo-Qiang1, YU Jin2, ZHANG Jie1, LI Yu-Tong1, YUAN Xiao-Hui1,3, ZHENG Zhi-Yuan1, WANG Peng1, WANG Zhao-Hua1, LING Wei-Jun1, WEI Zhi-Yi1
1Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080
2Laboratoire de Spectroétrie Ionique et Moléculaire, UMR CNRS 5579, Université Claude Bernard-Lyon 1,43, Bd. du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France
3State Key Laboratory of Transient Optics Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian 710068
Acoustic Diagnostics of Plasma Channels Induced by Intense Femtosecond Laser Pulses in Air
1Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080
2Laboratoire de Spectroétrie Ionique et Moléculaire, UMR CNRS 5579, Université Claude Bernard-Lyon 1,43, Bd. du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France
3State Key Laboratory of Transient Optics Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian 710068
Abstract： Long plasma channels induced by femtosecond laser pulses in air are diagnosed using the sonographic method. By detecting the sound signals along the channels, the length and the electron density of the channels are measured. Refocusing is also observed at different laser energies and different focal lengths. We find that the sonographic method has manifest advantages compared to other techniques.
2005, Vol. 22 
