Results 231 to 240 of about 55,652 (271)

Optical statistical classifiers using coherent and incoherent light

Applied Optics, 1979
Breast thermograms are digitally classified by means of a principal component analysis of a training set of breast spectral differences obtained in coherent light. The results are compared to the usual partition in categories of medical diagnosis. The statistical operators initiating the classification being expressed in terms of spatial frequencies ...
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Statistical properties of coherent radiation in a nonlinear optical amplifier

Physical Review A, 1980
The differential equation for the photon conditional probability distribution in a nonlinear amplifier is numerically solved, using the continuous approximation. Saturation effects on the development of fluctuations in the amplification of coherent light are studied. They are compared with the results obtained by solving the moment equations.
Guy Oliver, Cherif Bendjaballah
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Role of Statistics of Primary Excitations in Optical Coherence

1984
We examine the coherence properties of stationary light obtained by the superposition of nonstationary emissions, occurring at random space-time points. The positions of the points are uniformly distributed over the volume of the source. The emission times fluctuate in accordance with a stationary renewal point process.
M. C. Teich, B. E. A. Saleh, J. Perina
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Statistics of the depth-scan photocurrent in time-domain optical coherence tomography

Journal of the Optical Society of America A, 2007
We derive the time-variant second-order statistics of the depth-scan photocurrent in time-domain optical coherence tomography (TD-OCT) systems using polarized thermal light sources and superluminescent diodes (SLDs). Since the asymptotic-joint-probability-distribution function (JPDF) of the photocurrent due to polarized thermal light is Gaussian and ...
Sherif, S. S., Rosa, C. C., Flueraru, Costel, Chang, Shoude, Mao, Youxin, Podoleanu, A. G.   +5 more
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Influence of coherent properties of an optical field on the photocount statistics

Soviet Journal of Quantum Electronics, 1985
The asymmetry of photocount statistics in respect of the spatial and temporal coherence factors is demonstrated and explained. This asymmetry appears because of the "dead time" of a counter receiving a non-Poisson photoelectron flux. A statistical model of an optical field, photoelectron flux, and counting flux is used in a computer study of the ...
V G Astafurov, G N Glazov
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Statistical model for free-space optical coherent communications using adaptive optics

SPIE Proceedings, 2016
In this paper we present a new model for describing the turbulence-induced fading that uses the representation of the phase in the aperture plane as a collection of random “cells”. This model serves as input to calculate the probability density function of fading intensity. The model has two parameters: phase variance and number of wavefront cells . We
Esdras Anzuola, Szymon Gladysz
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A Statistical Treatment of Phasor Fields for a Partially-Coherent Optical Carrier

Imaging and Applied Optics Congress, 2020
The Phasor field (P-field) integral has been shown to describe non-line-of-sight (NLoS) imaging completely for an incoherent underlying optical carrier due to aperture roughness [1-4]. We present a statistical treatment showing an introduction of a P- field noise term due to partially-coherent light and explain why experiments conducted by Liu, et.al.,
Reza, Syed, Bauer, Sebastian, Velten, Andreas   +2 more
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Optical Coherence and Counting Statistics

1991
The coherence of a light field can be domonstrated by the phenomenon of interference. In the classical experiment of Thomas Young in 1801 the coherence was induced by arranging that the light diffracted by a fine slit should illuminate two parallel slits which then acted as two coherent sources. In the more modern version of the experiment a laser beam
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Statistics of A-scan photocurrent in time-domain optical coherence tomography

SPIE Proceedings, 2006
We model the photocurrent of an A-scan in time-domain optical coherence tomography (OCT) as a non-stationary random process and obtain its statistics. We use this model to obtain a maximum likelihood estimate of the reflectivity at different depths of an object. We also present an expression for the Fisher information matrix in time-domain OCT.
Sherif, Sherif S., Chang, Shoude, Flueraru, Costel   +2 more
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Statistical study of coherent images of particles in the volume of optical medium

SPIE Proceedings, 2014
In this paper, the problems of recognition of individual particle images in the volume of optical medium conditioned upon their coherent superposition are described. To evaluate the efficiency of methods of particle image recognition, a typical problem of analysis of the intensity distributions formed by laser radiation scattered on suspended particles
Tatiana Y. Nikolaeva, Nikolay V. Petrov
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