Results 231 to 240 of about 514,730 (263)

Partially coherent conical beams

Optics Letters, 2000
We introduce a new class of partially coherent beams that can propagate over large distances without changing their transverse profiles and their coherence properties. Such beams are generated by an incoherent superposition of identical fully coherent beams of arbitrary form, whose axes lie on a cone.
A V, Shchegrov, E, Wolf
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Partially coherent sources with circular coherence: comment

Optics Letters, 2017
In [Opt. Lett.42, 1512 (2017)OPLEDP0146-959210.1364/OL.42.001512], the authors present a new class of non-uniformly correlated sources with circular coherence. They also describe a basic experimental setup for synthesizing this class of sources, which uses the Van Cittert-Zernike theorem. Here, we present an alternative way to analyze these sources and
Milo W, Hyde, Santasri R, Bose-Pillai
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Extracting coherent modes from partially coherent wavefields

Optics Letters, 2009
Blank
Nugent, Keith A., Tran, Chanh Quoc., Quiney, H. M., Flewett, Samuel.   +3 more
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Cylindrical partially coherent scalar sources

Optics Letters, 2022
Partially coherent scalar sources with cylindrical symmetry radiating outwards are introduced. Homogeneous cross-spectral densities are shown to possess angularly modulated Hankel modes, whose amplitudes are subject to a filtering process during propagation. Simple criteria for treating such sources are given.
R. Martínez-Herrero, O. Korotkova, M. Santarsiero, G. Piquero, J. C. G. de Sande, A. V. Failla, F. Gori   +6 more
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Coherent detection of partially coherent sources

Optics Letters, 1980
The mean square of the beating component of the photodetector output current of a coherent optical or infrared receiver, illuminated by partially coherent quasi-monochromatic radiation, is expressed in terms of the mutual intensity functions of the signal and local reference fields on the detector’s active surface.
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Coherence requirements for partially coherent optical processing

Applied Optics, 1982
The mutual intensity function for a partially coherent light is used to develop an expression for the output intensity distribution for a broadband optical information processor. The coherence requirement for smeared image deblurring and image subtraction is then determined using the intensity distribution. We also quantitatively show the dependence of
S L, Zhuang, F T, Yu
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Coherent and partially coherent twisting beams

Optical Review, 1994
We present coherent and partially coherent beams that exhibit transverse pattern expansion and rotation upon free propagation. Coherent twisting beams may be generated by a suitable superposition of Laguerre-Gauss modes, while a model for partially coherent twisting beams is given by a continuous incoherent superposition of lowest order modes.
Franco Gori, Vittorio Bagini, Massimo Santarsiero, FREZZA, Fabrizio, Giuseppe Schettini, G. Schirripa Spagnolo   +5 more
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Coherence vortices in partially coherent beams

Optics Communications, 2003
It is demonstrated that the spectral degree of coherence of a partially coherent beam may possess isolated pairs of points at which its phase is singular, and that in the neighborhood of these points the phase may possess a vortex structure. Partially coherent beams consisting of Hermite-Gaussian modes are considered as an example.
Gbur, G.J., Visser, T.D.
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Coherent diffractive imaging and partial coherence

Physical Review B, 2007
We formulate coherent diffractive imaging in the framework of partially spatially coherent diffraction. We find that the reconstruction can be critically dependent on the degree of coherence in the illuminating field and that even a small departure from full coherence may invalidate the conventional assumption that a mapping exists between an exit ...
Williams, Garth J., Quiney, Harry M., Peele, Andrew G., Nugent, Keith A.   +3 more
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Partially coherent migration

GEOPHYSICS, 1993
Partially coherent migration reduces the spurious details introduced by velocity macro‐model imperfections. In a partially coherent migration, instead of summing coherently over the full aperture to achieve maximum lateral resolution, (1) a coherent stack is performed over a limited window width, and then (2) the collection of coherent stacks for ...
Delman Lee, Geoffrey M. Jackson, Iain M. Mason   +2 more
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