Ct. Law et Ga. Swartzlander, POLARIZED OPTICAL VORTEX SOLITONS - INSTABILITIES AND DYNAMICS IN KERR NONLINEAR MEDIA, Chaos, solitons and fractals, 4(8-9), 1994, pp. 1759-1766
Optical vortex solitons are known to be stable in a scalar nonlinear s
ystem, and they have even been observed. We now explore the effects of
polarization on the vortices, and find that they are unstable in Kerr
defocusing media, except when the beam is circularly polarized. Numer
ical simulations verify this and show remarkable beam evolution, inclu
ding vortex shedding and reversal of topological charge.