Stable three-dimensional optical solitons supported by competing quadratic and self-focusing cubic nonlinearities.
We show that the quadratic (chi(2)) interaction of fundamental and second harmonics in a bulk dispersive medium, combined with self-focusing cubic (chi(3)) nonlinearity, give rise to stable three-dimensional spatiotemporal solitons (STSs), despite the possibility of the supercritical collapse, induced by the chi(3) nonlinearity. At exact phase matching (beta = 0) , the STSs are stable for energies from zero up to a certain maximum value, while for beta not equal 0 the solitons are stable in energy intervals between finite limits.
Mihalache
D
D
ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain.
Mazilu
D
D
Malomed
B A
BA
Lederer
F
F
Crasovan
L-C
LC
Kartashov
Y V
YV
Torner
L
L