Results 141 to 150 of about 3,498,742 (390)

Hollow Gaussian Schell-model beam and its propagation

, 2007
In this paper, we present a new model, hollow Gaussian-Schell model beams (HGSMBs), to describe the practical dark hollow beams. An analytical propagation formula for HGSMBs passing through a paraxial first-order optical system is derived based on the ...
Arlt, Arlt, Cai, Cai, Clifford, Collins, de Angelis, Erdelyi, Ganic, Gase, Grimm, Heckenberg, Kasevich, Kuga, Li-Gang Wang, Li-Qin Wang, Lin, Lin, Mamaev, Mandel, Song, Srivastava, Timp, Wang, Yin, Yin, Yin, Yin, Zhang, Zhang, Zhao, Zwillinger   +31 more
core   +1 more source

Microstructural Evolution and Vacancy Defect Formation in Mn–Mo–Ni RPV Steel Under Low Cycle Fatigue: Insights From EBSD and PALS

Advanced Engineering Materials, EarlyView.
Low‐cycle fatigue damage in Mn–Mo–Ni reactor pressure vessel steel is examined using a combined electron backscatter diffraction and positron annihilation lifetime spectroscopy approach. The study correlates texture evolution, dislocation substructure development, and vacancy‐type defect formation across uniform, necked, and fracture regions, providing
Apu Sarkar, Dhanadeep Dutta, G. Bharat Reddy   +2 more
wiley   +1 more source

Optical coherence tomography: an arrow in our quiver [PDF]

, 2012
Andreas A. Giannopoulos, Yiannis S. Chatzizisis, George D. Giannoglou   +2 more
openalex   +1 more source

Advances in optical coherence tomography in dermatology—a review

Journal of Biomedical Optics, 2018
. Optical coherence tomography (OCT) was introduced as an imaging system, but like ultrasonography, other measures, such as blood perfusion and polarization of light, have enabled the technology to approach clinical utility. This review aims at providing
Jonas Olsen, J. Holmes, G. Jemec
semanticscholar   +1 more source

Thermomechanical Fatigue and Creep–Fatigue Interaction of Inconel 718 Additively Manufactured by Laser Beam Powder Bed Fusion

Advanced Engineering Materials, EarlyView.
Thermomechanical fatigue tests of laser beam powder bed fusion (PBF‐LB) Inconel 718 show that the additively manufactured material reaches almost the lifetimes of conventionally‐rolled material under no‐dwell conditions. Introducing dwell times at the maximum temperature markedly reduces the lifetimes due to pronounced grain boundary sliding associated
Stefan Guth, Tomáš Babinský, Jan Lars Riedel, Wen Hao Kan, Aijun Huang, Martin Heilmaier, Ivo Šulák   +6 more
wiley   +1 more source

Polarization sensitive optical coherence tomography - a review [Invited].

Biomedical Optics Express, 2017
Optical coherence tomography (OCT) is now a well-established modality for high-resolution cross-sectional and three-dimensional imaging of transparent and translucent samples and tissues.
J. D. de Boer, C. Hitzenberger, Y. Yasuno   +2 more
semanticscholar   +1 more source

Interleaved optical coherence tomography

Optics Express, 2013
We present a novel and cost-effective technique--interleaved optical coherence tomography (iOCT)--to enhance the imaging speed of swept source OCT systems by acquiring data from multiple lateral positions simultaneously during a single wavelength sweep, using a single detector and a virtually imaged phase array (VIPA) as a multi-band demultiplexer ...
Hee Yoon, Lee, Helge, Sudkamp, Tahereh, Marvdashti, Audrey K, Ellerbee   +3 more
openaire   +2 more sources

Effect of Laser Deoxidation on Adhesive‐Bonded Aluminum in an Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
This study investigates laser ablation of aluminum under oxygen‐free conditions. The goal is to produce oxide‐free substrates that enable improved adhesive bonding with epoxy. Optimized laser parameters (90% overlap, 300 µJ) combined with oxide‐free substrates result in the highest tensile strength of the adhesive bond.
Sandra Gerland, Finn‐Lennard Janthur, Sarah Seffer, Jörg Hermsdorf, Ludger Overmeyer, Annika Raatz   +5 more
wiley   +1 more source

Articular Cartilage Surface Topography and Roughness in Frozen Tissue Samples Using Optical Coherence Microscopy

مجلة النهرين للعلوم الهندسية, 2017
This paper describes a method to visualize the topography of the surface of cartilage. Optical Coherence Microscopy (OCM) technique has been used to get two dimensional images of frozen tissue samples of bovine articular cartilage.
Sadiq Jafer Abbass
doaj  

Three-channel robust optical encryption via engineering coherence Stokes vector of partially coherent light

PhotoniX
Optical encryption strategies utilizing fully coherent light have been widely explored but often face challenges such as speckle noise and beam instabilities.
Yonglei Liu, Zhen Dong, Yimeng Zhu, Haiyun Wang, Fei Wang, Yahong Chen, Yangjian Cai   +6 more
doaj   +1 more source