Results 61 to 70 of about 7,684 (263)

Caustics of Non-Paraxial Perfect Optical Vortices Generated by Toroidal Vortex Lenses

Photonics, 2021
In this paper, we consider the comparative formation of perfect optical vortices in the non-paraxial mode using various optical elements: non-paraxial and parabolic toroidal vortex lenses, as well as a vortex axicon in combination with a parabolic lens ...
Svetlana N. Khonina, Sergey I. Kharitonov, Sergey G. Volotovskiy, Viktor A. Soifer   +3 more
doaj   +1 more source

Astronomical demonstration of an optical vortex coronagraph

Optics Express, 2008
Using an optical vortex coronagraph and simple adaptive optics techniques, we have made the first convincing demonstration of an optical vortex coronagraph that is coupled to a star gazing telescope. We suppressed by 97% the primary star of a resolvable binary system, Cor Caroli. The stars had an angular separation of 1.9lambda/D at our imaging camera.
Grover A, Swartzlander, Erin L, Ford, Rukiah S, Abdul-Malik, Laird M, Close, Mary A, Peters, David M, Palacios, Daniel W, Wilson   +6 more
openaire   +2 more sources

Multimodal Data‐Driven Microstructure Characterization

Advanced Engineering Materials, EarlyView.
A self‐consistent autonomous workflow for EBSP‐based microstructure segmentation by integrating PCA, GMM clustering, and cNMF with information‐theoretic parameter selection, requiring no user input. An optimal ROI size related to characteristic grain size is identified.
Qi Zhang, Santiago Benito, Özge Özgün, Sebastian Weber, Markus Stricker   +4 more
wiley   +1 more source

Identification of Thermally-Tagged Coherent Structures in the Zero Pressure Gradient Turbulent Boundary Layer [PDF]

, 2013
A zero pressure gradient boundary layer over a flat plate is subjected to step changes in thermal condition at the wall, causing the formation of internal, heated layers.
Rought, Rebecca Lynn
core   +1 more source

Current Status and Challenges in Data Collection for Aerospace Coatings Deposited by Plasma Spraying

Advanced Engineering Materials, EarlyView.
An innovative approach has been integrated into the GRENAT project to optimize plasma spraying and coating performance. Raw materials are accelerated and melted in the plasma generated by torches, creating coatings. Monitoring sensors collect process data which are combined with ex situ characterization data.
Lila Randriamananjara, Vincent Rat, Quentin Dubreuil, Patrice Valorge, Simon Goutier, Alain Denoirjean, Olivier Messe, Céline Ruelle, Jean‐Philippe Poli   +8 more
wiley   +1 more source

Demonstration of traffic control and WDM routing in all-optical data vortex node [PDF]

, 2008
We demonstrate all-optical traffic control and self-routing of WDM optical packets in a cascaded two-node all-optical Data Vortex switching node.
Hyun-Do Jung, Tangdiongga, E Eduward, Tangdiongga, E., Jung, H.D., Koonen, AMJ Ton, Eduward Tangdiongga, A.M.J. Koonen, Tangdiongga, E.; id_orcid, Koonen, A.M.J., Jung, HD Hyun-Do   +9 more
core   +1 more source

Multi-band perfect vortex beam generation using all-dielectric metasurface

, 2023
Vortex beams offer a novel avenue for advancing information transmission, storage, and processing within the optical domain. However, conventional optical apparatus and systems depend on the phase accumulation technique to create vortex beams.
Massoud, Yehia Mahmoud, Rind, Yousaf Murtaza, Mehmood, M. Qasim, Tauqeer, Tauseef, Shafqat, M. Danial, Khan, Danial   +5 more
core   +1 more source

Microstructure Reconstruction in Battery Electrodes Using Machine Learning Based on Low‐Voltage Focused Ion Beam–Scanning Electron Microscopy Tomography Images

Advanced Engineering Materials, EarlyView.
Low‐voltage FIB‐SEM tomography combined with a image preprocessing pipeline improves phase contrast and enables reliable machine‐learning segmentation of conductive networks in lithium‐ion battery electrodes. Structural descriptors are extracted from segmented images, done semimanually and automated, and compared.
Lisa Beran, Vincent Nebel, Dominik Perius, Kshitij Kumar, Yannis Heim, Laura Bies, Tobias Kraus   +6 more
wiley   +1 more source

Spatiotemporal optical vortex reconnections of multi-vortices

Scientific Reports
Vortex reconnections are ubiquitous events found in diverse media. Here we show that vortex reconnections also occur between spatiotemporal vortices in optical waves.
Jordan Adams, Imad Agha, Andy Chong
doaj   +1 more source

Optical Vortex-Pumped KTiOAsO₄ Narrow-Linewidth Picosecond-Pulsed Parametric Oscillator

Applied Sciences
Herein, we present a picosecond-pulsed optical vortex parametric oscillator capable of generating high-power, narrow-linewidth near- and mid-infrared optical vortex outputs.
Xiazhuo Jiao, Jianqiang Ye, Mailikeguli Aihemaiti, Yuxia Zhou, Sujian Niu, Xining Yang   +5 more
doaj   +1 more source