author = "Petrov D"

Encontrado 19 documentos, página mostrada 1 de 2

Ultradilute low-dimensional liquids

Description: We calculate the energy of one- and two-dimensional weakly interacting Bose-Bose mixtures analytically in the Bogoliubov approximation and by using the diffusion Monte Carlo technique. We show that in the case of attractive inter- and repulsive intraspecies interactions the energy per particle has a...
Language(s): Inglés

Second-harmonic generation by intense beams containing phase dislocations:self-breaking into sets of solitons

Description: Second-harmonic generation of light in bulk quadratic non-linear media with intense input beams containing phase dislocations is studied numerically under conditions for TypeI phase-matching. We investigate how, above a threshold light intensity, the input beams self-split along the azimuthal direct...
Language(s): Inglés

Splitting of light beams with spiral phase dislocations into solitons in bulk quadratic nonlinear media

Description: We investigate the propagation of intense light beams in bulk quadratic nonlinear crystals under conditions for second-harmonic generation. We show numerically that input light beams with a spiral phase dislocation self-split in the crystal into several spatial solitons. The number and the pattern o...
Language(s): Inglés

Observation of topological charge pair nucleation in parametric wave mixing

Description: We report the observation of the nucleation of pairs of screw dislocations of opposite topological charges in second-harmonic generation processes in quadratic nonlinear media. The observation provides evidence about the conservation and evolution of the topological charge of light waves parametrica...
Language(s): Inglés

A simple method to generate optical beams with a screw phase dislocation

Description: In this work, it is shown experimentally that optical beams that contain a phase dislocation can be generated with a laser oscillating in the fundamental mode and a cylindrical-lens mode converter. , Peer Reviewed
Language(s): Inglés

Vortex streets in walking parametric wave mixing

Description: The combined effects of diffraction and Poynting vector walk-off in second-harmonic generation with pump beams that contain screw phase dislocations is addressed for what is believed to be the first time. We predict the spontaneous nucleation of multiple vortex twins whose subsequent explosion can y...
Language(s): Inglés

Vortex evolution in parametric wave mixing

Description: We investigate the evolution of vortex wave front dislocations in multiple-wave second-harmonic generation processes in quadratic nonlinear media. Vortices nested in finite-size host beams are shown to nucleate and to annihilate in pairs, and to move across the transverse wave front during the beam ...
Language(s): Inglés

Encontrado 19 documentos, página mostrada 1 de 2

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