Results 221 to 230 of about 10,727 (265)

Beam shaping of partially coherent light beams

Frontiers in Optics, 2003
Laser beams with a uniform profile or other kinds of profiles are desired in many applications, such as in laser fusion, laser heat treatment, and optical data proceeding etc.. Unfortunately a laser operated in TEM00 mode delivers a laser beams with a Gaussian profile. Therefore it is very important to reshape a laser beam with a profile to the desired
Jixiong Pu, Shojiro Nemoto
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Partially Coherent Beams

2009
Overview: In this chapter we study the effects of a spatially partially coherent beam. Several investigations of the properties of such beams have led to the conclusion that the use of a diffuser at the exit aperture of a coherent laser can produce reduced scintillations at the receiver under the proper conditions.
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Beam wander of partially coherent Airy beams

Journal of Modern Optics, 2014
The beam wander of a partially coherent Airy beam in a turbulent atmosphere was investigated. By using the extended Huygens–Fresnel integral, as analytical expression is derived for the second-order moment of a partially coherent Airy beam. Based on the theory proposed by Andrews, a general expression is obtained for the beam wander of a partially ...
Wei Wen, Xiuxiang Chu
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Generation of Partially Coherent Beams

2017
Abstract Partially coherent beams with a prescribed phase, state of polarization, and degree of coherence display many extraordinary propagation properties and are preferred in many applications, such as particle trapping, free-space optical communications, remote sensing, optical imaging, material thermal processing, image transformation, and ...
Yangjian Cai, Yahong Chen, Jiayi Yu, Xianlong Liu, Lin Liu   +4 more
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Matrix treatment for partially polarized, partially coherent beams

Optics Letters, 1998
A matrix method is outlined for dealing with quasi-monochromatic, partially polarized light when spatial coherence is not necessarily complete and propagation occurs along beams. Both spatial coherence and polarization properties are described by a single 2x2 matrix whose elements have the structure of mutual intensity functions.
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Beam shaping of partially coherent beams by use of the spatial coherence effect

SPIE Proceedings, 2005
We show that when a partially coherent beam with a Gaussian intensity distribution is focused by a lens, the intensity distribution near geometrical focus is strongly dependent upon the spatial coherence. Based on this, the desired intensity distribution near the focus can be generated by choosing appropriate form of spatial coherence. It is shown that
Jixiong Pu, Xiaoyun Liu
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Partially coherent vortex beams

Complex Light and Optical Forces XII, 2018
Beams with structured phase and beams with partial spatial coherence have both been considered for a variety of applications for many years, and it would seem natural to combine their advantageous properties. However, there is a conceptual difficulty in doing so because partially coherent beams lack a definite phase, which would seem to rule out a ...
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Coherent and partially coherent vortex beams in turbulence

Frontiers in Optics 2007/Laser Science XXIII/Organic Materials and Devices for Displays and Energy Conversion, 2007
The evolution of the scintillation and topological charge of coherent and partially coherent vortex beams in turbulence is analyzed. The possibility of using such beams in optical communications is discussed.
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Propagation of partially polarized, partially coherent beams

Journal of Optics A: Pure and Applied Optics, 2008
The propagation of partially polarized and partially coherent beams in free space is investigated. Using the partially polarized Gaussian Schell model beam as an example, closed-form propagation expressions are derived for the intensity distribution and the degree of polarization of the beam.
Yunli Qiu, Aijun Xu, Jinglin Liu, Junhu Yan   +3 more
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Evolution of singularities in a partially coherent vortex beam

Journal of the Optical Society of America A, 2009
We study the evolution of phase singularities and coherence singularities in a Laguerre-Gauss beam that is rendered partially coherent by letting it pass through a spatial light modulator. The original beam has an on-axis minumum of intensity--a phase singularity--that transforms into a maximum of the far-field intensity.
van Dijk, T., Visser, T.D.
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