Conical emission by four-photon parametric generation by using femtosecond laser pulses.
Conical continuum Stokes and anti-Stokes emissions are observed when intense 100-fs/620-nm ultrafast laser pulses propagate through an ethylene glycol medium. The angle of the anti-Stokes conical emission is modeled by class-II Raman and four-photon parametric generations in a small-scale filament with a nonlinear index change.
Xing
Q
Q
Yoo
K M
KM
Alfano
R R
RR