UDC 544.032.65
An original method for estimation of the characteristics of the areas with extreme intensity during filamentation of the ultrashort laser pulses in a turbulent medium has been developed. The method is intended to predict and interpret the experimental results for propagation conditions under different levels of turbulence. A reversal of collapse of beam self-focusing in a turbulent medium has been determined. The physical cause of this effect is the increase of random angular divergence of the beam during the nonlinear focusing stage.
laser radiation, self-focusing, self-channeling, turbulence
1. Petrischev V.A. O primenenii metoda momentov k nekotorym zadacham chastichno-kogerentnyh svetovyh puchkov // Izv. vuzov. Radiofiz. 1971. T. XIV, № 9. S. 1416 1426.
2. Chin S.L., Talebpour A., Yang J. et al. Filamentation of femtosecond laser pulses in turbulent air. // Appl. Phys. B. 2002. V.74, N 1. P. 67 76.
3. Thul D., Bernath R., Bodnar N. et al. The mobile ultrafast high energy facility – A new facility for high-intensity atmospheric laser propagation studies // Optics and lasers in Engineering. 2021. V. 140. P. 106519.
4. Stotts L.B., Penano J.R., Tellez J.A. et al. Engineering equations for the filamentation collapse distance in lossy, turbulent, nonlinear media // Opt. Express. 2019. V. 27. N 18. P. 25126 25141.
5. Zemlyanov A.A. Rezhimy rasprostraneniya uzkih (millimetrovyh) lazernyh puchkov v kerrovsko-nelineynoy turbulentnoy srede // Optika atmosfery i okeana. 2025. T. 38. № 12. S. 1 7.
