Abstract： We theoretically investigate the lifetime of self-guided plasma channel in air by launching an auxiliary delayed long-pulsed laser beam following an ultrashort laser. A detailed model makes the electron--ion recombination, the attachment of electrons on neutral particles, and particularly the impact ionization and electron-detachment mechanism incorporate. The calculated results show that the temporal evolution of electron density is greatly flattened and broadened. When the auxiliary laser intensity exceeds the threshold 3.32×104Wcm-2, the channel lifetime is distinctly prolonged from nanosecond to microsecond, or even longer due to the electrical field enhancement. Furthermore, with the laser intensity up to 109Wcm-2, the impact ionization overwhelms the detachment in effect. Thus, it is an effective way to extend the channel lifetime and provides a real opportunity for applications.
(Propagation, transmission, attenuation, and radiative transfer)
引用本文:
CHEN Xiao;JIANG Hong-Bing;GONG Qi-Huang. Lengthening the Lifetime of Long Plasma Channel in Air Generated by Femtosecond Laser Pulse[J]. 中国物理快报, 2006, 23(6): 1482-1485.
CHEN Xiao, JIANG Hong-Bing, GONG Qi-Huang. Lengthening the Lifetime of Long Plasma Channel in Air Generated by Femtosecond Laser Pulse. Chin. Phys. Lett., 2006, 23(6): 1482-1485.
2006, Vol. 23 
