  The effects of turbulence intensity and turbulence region on the distribution
of femtosecond laser filaments are experimentally elaborated. Through the
ultrasonic signals emitted by the filaments, and it is observed that increasing
turbulence intensity and expanding turbulence active region cause an increase
in the start position of the filament, and a decrease in filament length, which
can be well explained by the theoretical calculation. It is also observed that
the random perturbation of the air refractive index caused by atmospheric
turbulence expanded the spot size of the filament. Additionally, when
turbulence intensity reaches , multiple filaments are formed. Furthermore, the
standard deviation of the transverse displacement of filament is found to be
proportional to the square root of turbulent structure constant under the
experimental turbulence parameters in this paper. These results contribute to
the study of femtosecond laser propagation mechanisms in complex atmospheric
turbulence conditions
