Results 251 to 260 of about 20,337 (305)

Beam Spreading of Partially Coherent Beams Propagating through Turbulence Atmospheric in Boundary Layer

Advanced Materials Research, 2011
The cross-spectral density function of the partially coherent beam on 1.06μm is extended based on the generalized Huygens-Fresnel principle by using the Gaussian Schell-mode(GSM) and the modified Frehlich spectrum. And on the analysis of variation of the
Lv Hong
exaly   +2 more sources

Spreading of a heavy ion beam with the dual-ring double scattering method

Nuclear Instruments & Methods in Physics Research B, 2011
A flat radiation field for heavy ion beams is used in research experiments and clinical treatments. When a flat field is required, a beam spreading system must be installed for a beam line; thus a simple and affordable method is desirable. To achieve the
E Takeshita, T Inaniwa, Kota Mizushima   +2 more
exaly   +2 more sources

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Beam spreading of vortex beams propagating in turbulent atmosphere

Applied Optics, 2012
We present some results obtained by numerical modeling of the propagation of vortex beams LG(0l) through a randomly inhomogeneous medium. The vortex beams are the lower order Laguerre-Gaussian modes. Such beams, if propagated under conditions of weak turbulence, also experience distortions, like a Gaussian beam.
Vladimir P, Lukin, Peter A, Konyaev, Victor A, Sennikov   +2 more
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Gaussian beam spread in biological tissues

Applied Optics, 1990
Flux density distributions were measured in large tissue sections illuminated with 633- and 1064-nm laser radiation delivered by an optical fiber. The results were modeled by solving the 2-D diffusion approximation for an incident Gaussian beam and fitting the data with nonlinear regression.
L I, Grossweiner, J L, Karagiannes, P W, Johnson, Z, Zhang   +3 more
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Beam spread function with time dispersion

Applied Optics, 1998
An analytical model for the beam spread function with time dispersion is modeled and validated against Monte Carlo calculations. The model, which is structured on simple statistical concepts and relies on only first and second moments for displacement, angle, and multipath time, is suitable for describing pulsed laser radiation propagation in ...
J W, McLean, J D, Freeman, R E, Walker
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Importance of beam-beam tune spread to collective beam-beam instability in hadron colliders

Physical Review E, 2004
In hadron colliders, electron-beam compensation of beam-beam tune spread has been explored for a reduction of beam-beam effects. In this paper, effects of the tune-spread compensation on beam-beam instabilities were studied with a self-consistent beam-beam simulation in model lattices of Tevatron and Large Hodron Collider.
Lihui, Jin, Jicong, Shi
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Beam Spreading in a Turbulent Medium

Journal of the Optical Society of America, 1972
The Kolmogorov spectrum with its associated structure functions is generally used to study wave propagation in turbulent media. It is known, however, that this spectrum does not accurately represent the real atmosphere outside the inertial range. In this paper, the broadening of a focused gaussian beam is calculated, using instead a modified von Karman
J. L. Poirier, D. Korff
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Effective beam energy spreads with molecular ion beams

Nuclear Instruments and Methods, 1978
Abstract For several reasons it is sometimes desirable or necessary to use molecular hydrogen beams to produce nuclear reactions for materials analysis purposes. This paper presents the results of a study of the detailed characteristics of (p, γ) resonance yield curves obtained with molecular beams.
J.W. Butler, C.M. Davisson
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Spreading of Intense Laser Beams Due to Filamentation

Physical Review Letters, 1994
Channeling and filamentation of a laser beam is investigated experimentally and via computer simulations. A two-dimensional, fully nonlinear, fluid code has been developed and used to simulate the propagation of a laser pulse through an underdense plasma when [ital v][sub osc]/[ital v][sub [ital e]][similar to]1.
, Wilks, , Young, , Hammer, , Tabak, , Kruer   +4 more
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Spreading of partially coherent beams in random media

Journal of the Optical Society of America A, 2002
Some published computational work has suggested that partially coherent beams may be less susceptible to distortions caused by propagation through random media than fully coherent beams. In this paper this suggestion is studied quantitatively by examining the mean squared width of partially coherent beams in such media as a function of the propagation ...
Greg, Gbur, Emil, Wolf
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