Results 231 to 240 of about 10,727 (265)

Effect of dispersion on the spectrum of partially coherent beams

Journal of the Optical Society of America A, 2008
Taking the Gaussian Schell-model (GSM) beam as a typical example of partially coherent beams, the analytical expressions of the spectrum of GSM beams propagating in dispersive media are derived, and the spectral properties are studied in detail. It is shown that, in comparison with propagation in free space and in turbulence, whether or not GSM beams ...
Liuzhan, Pan, Xiao, Yuan, Chaoliang, Ding, Baida, Lü   +3 more
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Vortex array embedded in a partially coherent beam

Optics Letters, 2015
Method of generating a vortex array embedded in a partially coherent beam is proposed and experimentally demonstrated. The vortex array exists in the complex coherence function of a random field arising due to interference of three independent coherence functions with appropriate phase profiles.
Rakesh Kumar, Singh, Anandraj M, Sharma, P, Senthilkumaran   +2 more
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Synthesis of structured partially spatially coherent beams

Optics Letters, 2011
We report on the generation and rapid characterization of structured beams of arbitrary spatial coherence. An experimental setup is introduced capable of generating partially coherent fields by incoherently superposing fully coherent fields. The characterization is performed using the spectral information in the interferogram produced when using a two ...
C, Macías-Romero, R, Lim, M R, Foreman, P, Török   +3 more
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Intensity properties of partially coherent beam waves

Applied Optics, 1980
The extended Huygens-Fresnel principle is used to investigate the lateral coherence and the average on-axis intensity of partially coherent beam waves propagating in the turbulent atmosphere. A factor that determines the shift of the focal point toward the source when a beam wave propagates in turbulence is calculated.
M A, Plonus, C F, Ouyang, S C, Wang
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Generalized partially coherent beams with nonseparable phases

Optics Letters, 2019
A new, to the best of our knowledge, family of partially coherent beams incorporating a set of nonseparable phases is introduced. Due to the nonnegative definiteness of the cross-spectral density function, these phases cannot survive in the limit of full coherence, which distinguishes them from conventional phase terms. An example of a nonuniform model
Lipeng, Wan, Daomu, Zhao
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Partially coherent dual and quad airy beams

Optics Letters, 2019
We investigate the partially coherent dual and quad Airy beams, which are the partially coherent version of multiple Airy beams, in the framework of cross-spectral density functions. They are constructed by the superposition of two and four partially coherent Airy beams without reduced acceleration properties (rate and range).
Zihao, Pang, Daomu, Zhao
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Second-harmonic generation by a partially coherent beam

Physical Review A, 1987
The effect of degradation of the coherence of the pump beam by a random phase screen on the conversion efficiency in the second-harmonic generation process is considered. It is shown that, under suitable conditions, the conversion efficiency can be increased significantly.
, Zubairy, , McIver
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Partially coherent vortex beams with a separable phase

Optics Letters, 2003
We propose and experimentally implement a method for the generation of a wide class of partially spatially coherent vortex beams whose cross-spectral density has a separable functional form in polar coordinates. We study phase singularities of the spectral degree of coherence of the new beams.
Galina V, Bogatyryova, Christina V, Fel'de, Peter V, Polyanskii, Sergey A, Ponomarenko, Marat S, Soskin, Emil, Wolf   +5 more
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Average characteristics of partially coherent electromagnetic beams

Journal of the Optical Society of America A, 2000
Average characteristics of partially coherent electromagnetic beams are treated with the paraxial approximation. Azimuthally or radially polarized, azimuthally symmetric beams and linearly polarized dipolar beams are used as examples. The change in the mean squared width of the beam from its value at the location of the beam waist is found to be ...
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Thermodynamic Entropy of Partially Coherent Light Beams

Journal of the Physical Society of Japan, 1964
The thermodynamic entropy of partially coherent light beams, as shown by M. von Laue, is given by the sum of the entropy of the principal waves, which represent the given light beams and are statistically independent of each other. The principal waves and their intensities are respectively the eigenfunctions and eigenvalues of the mutual intensity ...
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