Results 81 to 90 of about 72,451 (334)

Effect of beam profile and partial coherence on coherent beam combining performance

Optics Communications, 2019
Abstract A numerical model of a coherent beam composed of a two-dimensional array of laser beams was developed; the model enables analysis of random phase mismatch in the combined system, as well as analysis of the influence of atmospheric turbulence.
Jan K. Jabczynski, Przemyslaw Gontar
openaire   +1 more source

Change in phase singularities of a partially coherent Gaussian vortex beam propagating in a GRIN fiber.

Optics Express, 2020
In this paper, we have derived the analytical formulae for the cross-spectral densities of partially coherent Gaussian vortex beams propagating in a gradient-index (GRIN) fiber.
Jing Wang, Shuai Yang, Miao-jun Guo, Zhifang Feng, Jinhong Li   +4 more
semanticscholar   +1 more source

Average intensity of a partially coherent anomalous hollow beam propagating in underwater oceanic turbulence

, 2019
Based on the extended Huygens–Fresnel principle, the cross-spectral density function of a partially coherent anomalous hollow beam (AHB) propagating in underwater oceanic turbulence has been derived.
Wang, Yaochuan, Zhong, Haiyang, Wang, Guiqiu, Liu, Dajun, Yin, Hongming   +4 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

The Spreading and Wander of a Gaussian Schell-Model Beam Through Oceanic Turbulence

Photonics
In this paper, we investigate the propagation properties of a partially coherent Gaussian Schell-model (GSM) beam by effective beam parameters in oceanic turbulence.
Ningjing Xiang
doaj   +1 more source

Coherence vortices in Mie scattered nonparaxial partially coherent beams

Optics Express, 2012
We have previously demonstrated that Mie scattering of partially coherent plane waves can create coherence vortices, namely screw-type dislocations in the phase of the spectral degree of coherence. However, plane waves are an idealization and in practice, optical beams are often much closer to reality.
Madara L, Marasinghe, Malin, Premaratne, David M, Paganin, Miguel A, Alonso   +3 more
openaire   +2 more sources

Designing Polymer Nanocomposites for X‐Ray Shielding: Mechanisms, Architectures, and Scalable Processing

Advanced Engineering Materials, EarlyView.
This review highlights advances in lightweight, lead‐free polymer nanocomposites for diagnostic X‐ray shielding. By linking filler chemistry, dispersion, architecture, and photon interaction mechanisms, it establishes structure–performance relationships guiding material design.
Aklilu G. Messele, Hossein Ipakchi, Tizazu H. Mekonnen   +2 more
wiley   +1 more source

Generation of an Adjustable Optical Cage through Focusing an Apertured Bessel-Gaussian Correlated Schell-Model Beam

Applied Sciences, 2019
An adjustable optical cage generated by focusing a partially coherent beam with nonconventional correlation function named the Bessel⁻Gaussian correlated Schell-model (BGCSM) beam is investigated in detail. With the help of the generalized Huygens&#
Lina Guo, Li Chen, Rong Lin, Minghui Zhang, Yaru Gao, Yangjian Cai   +5 more
doaj   +1 more source

Singularities of Partially Polarized Vortex Beams

Frontiers in Physics, 2020
Singularities in the polarization state of non-uniform electromagnetic beams have been a topic of both theoretical and practical interest for many years, as have singularities in the correlation functions of random scalar wavefields.
William Scott Raburn, Greg Gbur
doaj   +1 more source

Phase detection of coherence singularities and determination of the topological charge of a partially coherent vortex beam

Applied Physics Letters, 2019
In the theory of partial coherence, coherence singularities can occur in the spectral degree of coherence (SDOC): in case the fields at two different points are completely uncorrelated, the phase of the SDOC is undefined.
Xingyuan Lu, Chengliang Zhao, Yifeng Shao, Jun Zeng, S. Konijnenberg, Xinlei Zhu, S. Popov, H., P. Urbach, Y. Cai   +9 more
semanticscholar   +1 more source