Backward supercontinuum emission from a filament generated by ultrashort laser pulses in air.
Backward emission of the supercontinuum from a light filament induced by high-intensity femtosecond laser pulses propagating in air has been observed to be enhanced compared with linear Rayleigh-Mie scattering. This enhancement is interpreted as a nonlinear scattering process onto longitudinal refractive-index changes induced by the laser pulse itself. The spectral dependence of the supercontinuum angular distribution is also investigated.
Yu
J
J
Mondelain
D
D
Ange
G
G
Volk
R
R
Niedermeier
S
S
Wolf
J P
JP
Kasparian
J
J
Sauerbrey
R
R