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.
CNISM and Dipartimento di Fisica e Matematica, Università dell'Insubria, Via Valleggio 11, Como, 22100, Italy. daniele.faccio@uninsubria.it
D
D
Faccio
M
M
Clerici
A
A
Averchi
O
O
Jedrkiewicz
S
S
Tzortzakis
D G
DG
Papazoglou
F
F
Bragheri
L
L
Tartara
A
A
Trita
S
S
Henin
I
I
Cristiani
A
A
Couairon
P
P
Di Trapani
D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D017785:Photons; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation