Results 51 to 60 of about 2,764,686 (330)
Probing the modal characteristics of novel beam shapes [PDF]
, 2013 In this thesis, an investigation into the modal characteristics of novel beam shapes is presented. Sculpting the phase profile of a Gaussian beam can result in the generation of a beam with unique properties.
Mourka, Areti
core +2 more sources
Abruptly autofocusing vortex beams
Optics Express, 2012 We generate abruptly autofocusing beams that produce vortices at the focus. We give explicit equations for the phase-only Fourier masks that generate these beams including explanations for controlling the focal distance and numerical aperture. We show experimental results for the focal distance, the vortex pattern and show that the diameter of the ...
Jeffrey A, Davis +2 more
openaire +2 more sources
IEEE Photonics Journal, 2018 We originally exploit the vortex beams with patterns of closed polygons [namely, polygonal vortex beams (PVBs)] generated by a quasi-frequency-degenerate (QFD) Yb:CALGO laser resonator with astigmatic transformation. The PVBs with peculiar patterns of triangular, square, and parallelogram shapes carrying large orbital angular momentums (OAMs) are ...
Yijie Shen +4 more
openaire +3 more sources
Airy Transform of the New Power-Exponent-Phase Vortex Beam
Photonics, 2023 A new power-exponent-phase vortex beam with nonlinear phase winding has shown flexible control freedom compared with conventional vortex beams. In order to further enrich the modulation freedom and expand the ability of self-healing to meet current ...
Qidong Lin +6 more
doaj +1 more source
Research on Blind Area Suppression Technology for Vortex Beam Detection [PDF]
Hangkong bingqiTo address the problem of far-target detection blind areas caused by the dark hollow regions in the propagation direction of vortex beams， a method based on the coherent synthesis of vortex superposition using a ring-beam array is proposed.
Peng Zhiyong, Tu Yan, Zhang Ninghua, Zhou Shuping, Zhao Zidan, Xie Guanghui
doaj +1 more source
Vector Vortex Beam Emitter Embedded in a Photonic Chip. [PDF]
Physical Review Letters, 2019 Vector vortex beams simultaneously carrying spin and orbital angular momentum of light promise additional degrees of freedom for modern optics and emerging resources for both classical and quantum information technologies.
Yuan Chen +9 more
semanticscholar +1 more source
Optical vortex braiding with Bessel beams
Optics Letters, 2020 We propose the braiding of optical vortices in a laser beam with more than 2 π rotation by superposing Bessel modes with a plane wave. We experimentally demonstrate this by using a Bessel–Gaussian beam and a coaxial Gaussian, and we present measurements of three complete braids. The amount of braiding is fundamentally limited only
Andrew A. Voitiv +3 more
openaire +3 more sources
Distributed lock-in drives broadband vortex-induced vibrations of a long flexible cylinder in shear flow [PDF]
, 2013 A slender flexible body immersed in sheared cross-flow may exhibit vortex-induced vibrations (VIVs) involving a wide range of excited frequencies and structural wavenumbers.
Triantafyllou, Michael S. +2 more
core +1 more source
Manipulation of Energy Flow with X-Type Vortex
Photonics, 2022 In this study, a new method for manipulating energy flow in a 3D vector field is proposed. In this method, an azimuthally-polarized beam with a noncanonical vortex, the X-type vortex, is focused in a high-numerical aperture system.
Han Zhang +3 more
doaj +1 more source
Pulsed polarized vortex beam enabled by metafiber lasers
PhotoniXPulsed polarized vortex beams, a special form of structured light, are generated by tailoring the light beam spatiotemporally and witness the growing application demands in nonlinear optics such as ultrafast laser processing and surface plasma excitation.
Chen-Xi Zhang +5 more
semanticscholar +1 more source