Kerr-induced spontaneous Bessel beam formation in the regime of strong two-photon absorption.
We study the effect of Two-Photon Absorption (TPA) nonlinear losses on Gaussian pulses, with power that exceeds the critical power for self-focusing, propagating in bulk kerr media. Experiments performed in fused silica and silicon highlight a spontaneous reshaping of the input pulse into a pulsed Bessel beam. A filament is formed in which sub-diffractive propagation is sustained by the Bessel-nature of the pulse.
Faccio
D
D
CNISM and Dipartimento di Fisica e Matematica, Università dell'Insubria, Via Valleggio 11, Como, 22100, Italy. daniele.faccio@uninsubria.it
Clerici
M
M
Averchi
A
A
Jedrkiewicz
O
O
Tzortzakis
S
S
Papazoglou
D G
DG
Bragheri
F
F
Tartara
L
L
Trita
A
A
Henin
S
S
Cristiani
I
I
Couairon
A
A
Di Trapani
P
P
D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D017785:Photons; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation