A new type of long-lived solitary structures for paraxial optics with two circular polarizations light in a homogeneous defocusing Kerr medium an anomalous group velocity dispersion has been revealed numerically the coupled nonlinear Schrödinger equations. found hybrid three-dimensional soliton is vortex ring against background plane wave one components, and core filled another component nonuni...

A series of four V-shaped methylpyrimidinium salts bearing diphenylamino-electron-donating groups appended at various pyrimidine positions were designed. These chromophores obtained by regioselective N(1) monomethylation methyl methanesulfonate the core. Linear optical properties studied experimentally and electronic further completed (TD)-DFT calculations. The second-order nonlinear (NLO) also...