Optimum small-scale management of random beam perturbations in a femtosecond laser pulse

摘要

We have performed statistical simulations of stochastic filament control in a femtosecond laser pulse. Suppression of random multiple filaments is performed by means of a mesh introduced into the transverse beam section at the laser system output. The optimum size of a single square mesh unit contains (3.1 -3.2) P_(cr) for self-focusing in the medium. Controlled filaments are formed in several groups along the laser pulse propagation direction. Almost simultaneous formation of multiple-filaments can be attained by means of spatial modulation of the mesh transmission coefficient.