Widening of Long-range femtosecond laser filaments in turbulent air.
The influence of air turbulence on the long-range filamentation of femtosecond laser pulses has been numerically investigated. Simulations are performed for different parameters of air turbulence and laser pulses. Simulation results indicate that the diameter of filaments formed by free propagated fs laser pulse can be widened to mm level under air turbulence. However, the widening effect can be suppressed if the propagating distance before the on-set position of filamentation becomes shorter. The reduction of non-linear focal length can be realized by pre-focusing of the laser pulse or increasing of the laser intensity. The effect of the inner scale of air turbulence on the filamentation has also been studied.
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China.
Yuan-Yuan
YY
Ma
Xin
X
Lu
Ting-Ting
TT
Xi
Qi-Huang
QH
Gong
Jie
J
Zhang
D000388:Air; D003198:Computer Simulation; D007834:Lasers; D008027:Light; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D012815:Signal Processing, Computer-Assisted