Results 51 to 60 of about 50,799 (157)

Coherent diffusion of partial spatial coherence

Optica, 2019
Partially coherent light is abundant in many physical systems, and its propagation properties are well understood. Here we extend current theory of propagation of partially coherent light beams to the field of coherent diffusion. Based on a unique four-wave mixing scheme of electro-magnetically induced transparency, an optical speckle pattern is ...
Ronen Chriki, Slava Smartsev, David Eger, Ofer Firstenberg, Nir Davidson   +4 more
openaire   +2 more sources

Multimodal imaging in posterior microphthalmos

Journal of Current Ophthalmology, 2019
Purpose: To evaluate the multimodal imaging including optical coherence tomography angiography (OCTA) findings in patients with posterior microphthalmos (PM).
Reza Karkhaneh, Ahmad Masoumi, Nazanin Ebrahimiadib, Hormoz Chams, Mojtaba Abrishami   +4 more
doaj   +1 more source

Rewriting techniques for relative coherence [PDF]

Logical Methods in Computer Science
A series of works has established rewriting as an essential tool in order to prove coherence properties of algebraic structures, such as MacLane's coherence theorem for monoidal categories, based on the observation that, under reasonable assumptions ...
Samuel Mimram
doaj   +1 more source

Comparison of Partial Coherence Interferometry and Optic Low Coherence Reflectometry for Intraocular Lens Power Calculation in Cataract Patients

Türk Oftalmoloji Dergisi, 2014
Objectives: To compare the measurements obtained by partial coherence interferometry (PCI) (AL Scan, Nidek) and optical low coherence reflectometry (OLCR) (Lenstar, Haag-Streit AG) and to evaluate the inter-device differences with respect to deviation ...
Mustafa Doğan, Onur Polat, Mahmut Karadaş, Tuncay Küsbeci, Güliz Fatma Yavaş, Sibel İnan, Ümit Übeyt İnan   +6 more
doaj   +1 more source

Temporal and spatial coherence properties of free-electron-laser pulses in the extreme ultraviolet regime

Physical Review Special Topics. Accelerators and Beams, 2011
The average temporal (longitudinal) and spatial (transverse) coherence of free-electron-laser pulses in the extreme ultraviolet at FLASH is measured by interfering two time-delayed partial beams directly on a CCD camera.
S. Roling, B. Siemer, M. Wöstmann, H. Zacharias, R. Mitzner, A. Singer, K. Tiedtke, I. A. Vartanyants   +7 more
doaj   +1 more source

Scattering of partially coherent surface plasmon polariton fields by metallic nanostripe

Journal of the European Optical Society-Rapid Publications, 2019
Background Surface plasmon polaritons (SPPs) are electromagnetic waves that propagate at a metal-dielectric interface. Until recently, monochromatic, fully coherent SPPs have mainly been considered.
Salman Daniel, Kimmo Saastamoinen, Sergey A. Ponomarenko, Ari T. Friberg   +3 more
doaj   +1 more source

Impact of malnutrition on education inequality in Africa: A partial wavelet coherence analysis

South African Journal of Economic and Management Sciences
Background: The scourge of malnutrition in Africa is a significant obstacle to children’s education, impeding their learning ability and perpetuating poor health.
Rasaq Raimi, Andrew Phiri
doaj   +1 more source

Accurate Light Field Depth Estimation Using Multi-Orientation Partial Angular Coherence

IEEE Access, 2019
Occlusion is a critical issue that affects the accuracy for light field depth estimation. In the presence of occlusions, the photo-consistency property is broken, making ambiguity near occlusion areas.
Zhenghua Guo, Junlong Wu, Xianfeng Chen, Shuai Ma, Licheng Zhu, Ping Yang, Bing Xu   +6 more
doaj   +1 more source

Agreements' profile of Scheimpflug-based optical biometer with gold standard partial coherence interferometry. [PDF]

Int J Ophthalmol, 2023
Sardari S, Fotouhi A, Jafarzadehpur E, Khabazkhoob M.   +3 more
europepmc   +1 more source

Agreement and relationship between ultrasonic and partial coherence interferometry measurements of axial length and anterior chamber depth

Clinical Ophthalmology, 2012
Amany R Wissa, Sherein S Wahba, Maged M RoshdyAin Shams University and National Eye Hospital, Cairo, EgyptPurpose: To find the relationship between axial length (AL) and anterior chamber depth (ACD) measurements, using partial coherence interferometry ...
Wissa AR, Wahba SS, Roshdy MM
doaj