Results 21 to 30 of about 55,430 (276)
Controlling the Spatial Coherence of an Optical Source Using a Spatial Filter
Applied Sciences, 2018 This paper presents the theory for controlling the spectral degree of coherence via spatial filtering. Starting with a quasi-homogeneous partially coherent source, the cross-spectral density function of the field at the output of the spatial filter is ...
Milo W. Hyde
doaj +1 more source
Optics Express, 2014 Noise statistics of phase-resolved optical coherence tomography (OCT) imaging are complicated and involve noises of OCT, correlation of signals, and speckles. In this paper, the statistical properties of phase shift between two OCT signals that contain additive random noises and speckle noises are presented.
Shuichi, Makita +3 more
openaire +2 more sources
Effects of energy spread on Brightness and Coherence of undulator sources [PDF]
, 2018 The (spectral) brightness for partially transverse coherent sources as Synchrotron Radiation (SR) and Free-Electron Laser (FEL) sources can be defined as the maximum of the Wigner distribution.
Geloni, Gianluca +4 more
core +2 more sources
Results in Physics, 2019 This paper presents a method to control both the shape and polarization of a beam in the far field using a vector Schell-model source. Given a desired far-zone beam shape and polarization, and applying Fourier and statistical optics theory, we derive the
Milo W. Hyde, IV
doaj +1 more source
Applied Sciences, 2019 Ghost imaging (GI) is an indirect imaging approach that can retrieve an object’s image even in a harsh environment through measuring the fourth-order correlation function (FOCF) between the signal and idle optical paths.
Yonglei Liu +5 more
doaj +1 more source
Partially Coherent Flat-Topped Beam Generated by an Axicon
Applied Sciences, 2019 The intensity distribution of a partially coherent beam with a nonconventional correlation function, named the multi-Gaussian Schell-model (MGSM) beam, focused by an axicon was investigated in detail.
Minghui Zhang +4 more
doaj +1 more source
Mobility and transverse flow visualization using phase variance contrast with spectral domain optical coherence tomography [PDF]
, 2007 Phase variance-based motion contrast is demonstrated using two phase analysis methods in a spectral domain optical coherence tomography system. Mobility contrast is demonstrated for an intensity matched Intralipid solution placed without flow within ...
Fingler, Jeff +3 more
core +1 more source
Transverse coherence properties of X-ray beams in third-generation synchrotron radiation sources
, 2008 This article describes a complete theory of spatial coherence for undulator radiation sources. Current estimations of coherence properties often assume that undulator sources are quasi-homogeneous, like thermal sources, and rely on the application of the
Bahrdt +23 more
core +1 more source
Generation and Propagation of a Hermite-Gaussian Correlated Schell-Model LG0l Beam
Applied Sciences, 2019 A partially coherent beam under the combined action of a Hermite-Gaussian correlated function and vortex phase, named the HGCSMLG0l beam has been explored both theoretically and experimentally.
Xiaofeng Peng +6 more
doaj +1 more source
Statistical Models of Signal and Noise and Fundamental Limits of Segmentation Accuracy in Retinal Optical Coherence Tomography [PDF]
IEEE Transactions on Medical Imaging, 2018 Optical coherence tomography (OCT) has revolutionized diagnosis and prognosis of ophthalmic diseases by visualization and measurement of retinal layers. To speed up the quantitative analysis of disease biomarkers, an increasing number of automatic segmentation algorithms have been proposed to estimate the boundary locations of retinal layers. While the
Theodore B. Dubose +5 more
openaire +2 more sources