Results 251 to 260 of about 2,047,243 (297)

Self-focusing of a partially coherent beam with circular coherence

Journal of the Optical Society of America A, 2017
In a recent publication [Opt. Lett.42, 1512 (2017)OPLEDP0146-959210.1364/OL.42.001512], a novel class of partially coherent sources with circular coherence was introduced. In this paper, we examine the propagation behavior of the spectral density and the spectral degree of spatial coherence of a beam generated by such a source in free space and in ...
Chaoliang Ding, Matias Koivurova, Jari Turunen, Liuzhan Pan   +3 more
openaire   +2 more sources

Partially coherent bottle beams

Optics Communications, 2005
We theoretically investigate the three-dimensional intensity distribution of the partially coherent beams focused by a lens. It is shown that the intensity distribution in the neighborhood of the geometrical focus is not only dependent on the intensity distribution of the incident partially coherent beam, but also on its coherence.
Jixiong Pu, Xiaoyun Liu, Shojiro Nemoto
openaire   +1 more source

Partially coherent beam propagation

SPIE Proceedings, 2003
We investigate the propagation of a partially coherent beam produce by a plane source. By utilizing Helmholtz equation, the intensity of the source in plane z = 0, and plane z are obtained. Then by considering new theoretical prediction on cross-spectral density function of the field in the plane z = 0, the root-means square (rms) beam radius, as a ...
H. Tajalli, M. Sahrai
openaire   +1 more source

Beam shaping of focused partially coherent beams by use of the spatial coherence effect

Applied Optics, 2004
We demonstrate that when a partially coherent beam with a Gaussian intensity distribution is focused by a lens, the desired partially coherent flat-topped intensity distribution or doughnut-shaped intensity distribution at the geometrical focus can be generated by choice of appropriate form of spectral degree of coherence.
Jixiong, Pu, Shojiro, Nemoto, Xiaoyun, Liu   +2 more
openaire   +2 more sources

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
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +2 more sources

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
openaire   +1 more source