Filamentation analysis in large-mode-area fiber lasers

Lei Sun, John R. Marciante
2007 Journal of the Optical Society of America. B, Optical physics  
Starting from the paraxial wave equation, an analytic expression for filament threshold in fiber lasers is derived. The occurrence of filamentation is determined by the larger of two thresholds, one of perturbative gain and one of spatial confinement. The threshold value is approximately a few megawatts, depending on the parameters of the fiber.
doi:10.1364/josab.24.002321 fatcat:abfbkcuk5nhnbktmawgpw3sxte