Results 261 to 270 of about 44,596 (308)

Generation of vortex lightbeams

MIPPR 2019: Multispectral Image Acquisition, Processing, and Analysis, 2020
Generally, the vortex lightwaves are beams that propagates helically along an axis. In an optical vortex, light is twisted. Due to their twisting property, the light at the position of the axis cancels each other. If the vortex is projected onto a plane, its image looks like a halo, with a dark area without light in the middle.
Chang Liu, Dong Wei, Mingce Chen, Xinyu Zhang   +3 more
openaire   +1 more source

Generalized transport vortex method

Computers & Fluids, 2007
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Zhao, J., Chew, Y.T., Luo, S.C., Pan, L.S., Wu, J.K.   +4 more
openaire   +2 more sources

Intracavity vortex beam generation

SPIE Proceedings, 2011
In this paper we explore vortex beams and in particular the generation of single LG0l modes and superpositions thereof. Vortex beams carry orbital angular momentum (OAM) and this intrinsic property makes them prevalent in transferring this OAM to matter and to be used in quantum information processing.
Darryl Naidoo, Kamel Aït-Ameur, Andrew Forbes   +2 more
openaire   +1 more source

Vortex Ring Generator

1998
Abstract : The U.S. Marine Corps Joint Nonlethal Weapons Directorate tasked the U.S. Army to demonstrate a means of quickly converting the Navy MK19-3 automatic 40-mm grenade launcher between lethal and nonlethal modes of operation. The Army Research Laboratory (ARL) teamed with the Armament Research and Development Engineering Center (ARDEC) to ...
Louis Jasper, George Lucey
openaire   +1 more source

Viscous vortex core generation

Acta Mechanica, 1987
The unsteady flow of a viscous incompressible fluid between two porous co-axial circular cylinders is analysed when the outer cylinder is impulsively set into rotation. When there is a radial inflow, vorticity is transferred from an unsteady boundary layer initially over the outer cylinder to a steady boundary layer over the inner cylinder.
Bellamy-Knights, P. G., Saci, R.
openaire   +2 more sources

Polarization-vortex-driven second-harmonic generation

Optics Letters, 2003
Polarization vortices exist in the focus of a class of vector beams, the lowest order of which possess full vector symmetry about the axis of propagation of the beam. At high numerical apertures these beams are known to exhibit large, local, longitudinal fields in the focal region.
D P, Biss, T G, Brown
openaire   +2 more sources

Generation of broadband terahertz vortex beams

Optics Letters, 2014
We propose and demonstrate a method for generating broadband terahertz (THz) vortex beams. We convert a THz radially polarized beam into a THz vortex beam via achromatic polarization optical elements for THz waves and characterize the topological charge of the generated vortex beam by measuring the spatial distribution of the phase of the THz wave at ...
Ryo, Imai, Natsuki, Kanda, Takuya, Higuchi, Kuniaki, Konishi, Makoto, Kuwata-Gonokami   +4 more
openaire   +2 more sources

Vortex generation reaches a new plateau

Science, 2017
Surface engineering provides a powerful platform for vortex and structured wave ...
Cheng-Wei, Qiu, Yuanjie, Yang
openaire   +2 more sources

Generation of perfect vectorial vortex beams

Optics Letters, 2016
We propose the concept of perfect vectorial vortex beams (VVBs), which not merely have intensity profile independent of the polarization order and the topological charge of spiral phase, but also have stable intensity profile and state of polarization (SoP) upon propagation. Utilizing a Sagnac interferometer, we approximately generate perfect VVBs with
Peng, Li, Yi, Zhang, Sheng, Liu, Chaojie, Ma, Lei, Han, Huachao, Cheng, Jianlin, Zhao   +6 more
openaire   +2 more sources

Sound generation by shock–vortex interactions

Journal of Fluid Mechanics, 1999
Two-dimensional, unsteady, compressible flow fields produced by the interactions between a single vortex or a pair of vortices and a shock wave are simulated numerically. The Navier–Stokes equations are solved by a finite difference method. The sixth-order-accurate compact Padé scheme is used for spatial derivatives, together with the fourth ...
Inoue, Osamu, Hattori, Yuji
openaire   +2 more sources