Two-dimensional solitons with second-order nonlinearities.
We investigate the propagation of intense Gaussian beams in materials with quadratic nonlinearity. Excitation of (2 + 1) solitons is numerically predicted at finite phase mismatch and in the presence of linear walk-off between the fundamental and second-harmonic waves. The numerical results are interpreted in terms of the conserved quantities of the wave evolution, and the appropriate conditions for the experimental observation of the solitons are discussed.
L
L
Torner
C R
CR
Menyuk
W E
WE
Torruellas
G I
GI
Stegeman