Grupinio greičio dispersijos įtaka femtosekundinio lazerio su aukštesniosios eilės Kero efektu filamen- tacijai įvairaus slėgio atmosferoje

Anotacija

The impact of group velocity dispersion (GVD) on femtosecond laser filamentation with the higher-order Kerr
effect is studied at different atmospheric pressures. The results show that GVD makes the collapse distance to not meet the semi-empirical formula proposed by Dawes and Marburger, suppresses multiple focusing and splitting in time during the propagation process, and reduces the length of filament. In addition, we also compared the results with those considering only the third-order Kerr effect. This provides some information for the study of whether the defocus effect in the femtosecond laser filamentation is the higher-order Kerr effect or the plasma effect.