Suchergebnisse

We find families of vortex solitary waves in bulk quadratic nonlinear media under conditions for second-harmonic generation. We show that the vortex solitary waves are azimuthally unstable and that they decay into sets of stable spatial solitons. We calculate the growth rates of the azimuthal perturbations and show how those affect the pattern of output light. © 1998 Optical Society of America ; This work has been partially supported by the Spanish Government under grant PB95-0768. ; Peer Reviewed

We describe the principle of operation of a new class of optical devices operating in quadratic non-linear media that mix wave front topological charge dislocations nested in focused light beams and produce certain patterns of bright spatial solitons. Central to the device behaviour is the orbital angular momentum of the light beams. ; This work has been supported by the Spanish Government under contract PB95-0768. The numerical work has been carried out at the Centre de Computacio i Communicacions de Catalunya. The work of J. M. S. C. wassupported by the Comunidad de Madrid under contract 06T/039/96 and by the CICyT under contract TIC95-0563-03. ; Peer Reviewed