Results 21 to 30 of about 7,330 (242)

Generating electromagnetic Schell-model sources using complex screens with spatially varying auto- and cross-correlation functions

Results in Physics, 2019
We present a method to generate any physically realizable electromagnetic Schell-model source. Our technique can be directly implemented on existing vector-beam generators that utilize spatial light modulators for coherence control, beam shaping, and ...
Milo W. Hyde, IV
doaj   +1 more source

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

Shaping the far-zone intensity, degree of polarization, angle of polarization, and ellipticity angle using vector Schell-model 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

Ghost Imaging with a Partially Coherent Beam Carrying Twist Phase in a Turbulent Ocean: A Numerical Approach

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, Xianlong Liu, Lin Liu, Fei Wang, Yuping Zhang, Yangjian Cai   +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, Xianlong Liu, Lina Guo, Lin Liu, Yangjian Cai   +4 more
doaj   +1 more source

Generation and Propagation of a Hermite-Gaussian Correlated Schell-Model LG_0l 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, Xingyuan Lu, Xianlong Liu, Chenliang Zhao, Rong Lin, Lin Liu, Yangjian Cai   +6 more
doaj   +1 more source

Statistical moments-based OSNR monitoring for coherent optical systems

Optics Express, 2012
We present a novel statistical moments-based method for optical signal-to-noise ratio (OSNR) monitoring in polarization-multiplexed (pol-mux) coherent optical systems. This technique only requires the knowledge of the envelope of the equalized signal before phase correction, which can be achieved by using any two arbitrary statistical moments, and it ...
Chen, Zhu, An V, Tran, Simin, Chen, Liang B, Du, Cuong C, Do, Trevor, Anderson, Arthur J, Lowery, Efstratios, Skafidas   +7 more
openaire   +2 more sources

Innovative Multi-Site Photoplethysmography Analysis for Quantifying Pulse Amplitude and Timing Variability Characteristics in Peripheral Arterial Disease

Diseases, 2018
Photoplethysmography (PPG) is a simple-to-perform vascular optics measurement technique that can detect blood volume changes in the microvascular bed of tissue.
Michael Bentham, Gerard Stansby, John Allen   +2 more
doaj   +1 more source

Statistical Properties of Phase-Decorrelation in Phase-Resolved Doppler Optical Coherence Tomography [PDF]

IEEE Transactions on Medical Imaging, 2009
Decorrelation noise limits the ability of phase-resolved Doppler optical coherence tomography systems to detect smaller vessels exhibiting slower flow velocities, which limits the utility of the technique in many clinical and biological settings. An understanding of the statistical properties of decorrelation noise can aid in the optimal design of ...
Benjamin J. Vakoc, Guillermo J. Tearney, Brett E. Bouma   +2 more
openaire   +2 more sources

BMT4me En Español: Multisite Feasibility and Usability Testing of a Spanish‐Language mHealth Adherence Support App for Spanish‐Speaking Caregivers of Children After Hematopoietic Stem Cell Transplantation and Cancer Treatment

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Medication nonadherence during the first 100 days after pediatric hematopoietic stem cell transplantation (HSCT) and during oncology treatment increases risk for complications. BMT4me is a caregiver‐facing mobile health (mHealth) application providing medication reminders, symptom tracking, and note‐taking features to support ...
Micah A. Skeens, Madeline R. Peek, Bianca Franklin, Emre Sezgin, Melissa Beauchemin   +4 more
wiley   +1 more source