| Original Articles |
|
|
|
|
Lengthening the Lifetime of Long Plasma Channel in Air Generated by Femtosecond Laser Pulse |
| CHEN Xiao;JIANG Hong-Bing;GONG Qi-Huang |
| State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871 |
|
| Cite this article: |
|
CHEN Xiao, JIANG Hong-Bing, GONG Qi-Huang 2006 Chin. Phys. Lett. 23 1482-1485 |
|
|
|
|
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.
|
| Keywords:
42.65.Jx
42.68.Ay
|
|
|
Published: 01 June 2006
|
|
| PACS: |
42.65.Jx
|
(Beam trapping, self-focusing and defocusing; self-phase modulation)
|
| |
42.68.Ay
|
(Propagation, transmission, attenuation, and radiative transfer)
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
