Results 171 to 180 of about 11,205 (213)

Spatiotemporal statistics of optical turbulence beyond Taylor’s frozen turbulence hypothesis

Journal of the Optical Society of America A
Currently, limitations in modeling the temporal behavior of light propagating through atmospheric turbulence stem from the Taylor’s frozen turbulence hypothesis (TFTH). Indeed, under certain conditions it has been reported to be unreliable, often leading to inaccurate predictions.
Darío G. Pérez, Hishan Farfán-Bachiloglu, Marco Sepúlveda   +2 more
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Optical communications in atmospheric turbulence

SPIE Proceedings, 2009
Recent experiments conducted under the Optical RF Communications Adjunct program demonstrate and validate the viability of hybrid free space optical communications links in heavy atmospheric turbulence. Long range air-to-mountain link closures were established under extreme atmospheric turbulence.
Larry B. Stotts, Brian Stadler, David Hughes, Paul Kolodzy, Alan Pike, David W. Young, Joseph Sluz, Juan Juarez, Buzz Graves, Dave Dougherty, Jeff Douglass, Todd Martin   +11 more
openaire   +1 more source

Weak Optical Turbulence in Class-A Nonlinear Optical Systems

EQEC'96. 1996 European Quantum Electronic Conference, 1996
Transverse pattern formation and weak optical turbulence is theoretically investigated in multi-transverse-mode class-A nonlinear optical systems (primarily class-A lasers). It is shown, that "nontrivial patterns" occur due to transverse mode locking to a common frequency in class-A nonlinear optical systems.
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Atmospheric Models Of Optical Turbulence

SPIE Proceedings, 1988
Optical turbulence is observed to cause beam wander, scintillation, small coherence lengths, limited bandwidths and isoplanatism constraints on the propagation of visible wavelength laser beams. Developers of laser systems and electro-optical systems need to know and employ the appropriate representations of turbulence in order to estimate their real ...
R. E. Good, R. R. Beland, E. A. Murphy, J. H. Brown, E. M. Dewan   +4 more
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An optical study of turbulence

Journal of Fluid Mechanics, 1970
This paper describes theoretical and experimental work carried out at the Cavendish Laboratory of the University of Cambridge. The main object of the work was to develop a new technique for measuring the structure of fluid turbulence.A parallel beam of light is passed through the turbulent region, containing refractive index fluctuations, and analyzed ...
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Optical Topologies in Turbulence

Optica Imaging Congress 2024 (3D, AOMS, COSI, ISA, pcAOP)
Light can be imbued with a topology, but is the topological invariant immune to turbulence? Here I outline how to find invariants in light's degrees of freedom for noise-free communication through turbulence.
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Optical Turbulence in Semiconductor Lasers

1993
In this paper we study the dynamics of broad-area semiconductor lasers and arrays. In the case of the former, our numerical simulations show symmetry breaking as transverse modulation instabilities develop leading to optical turbulence: temporal chaos and random filamentation of the output beam.
E. Abraham, H. Adachihara, O. Hess, R. A. Indik, P. Jacobsen, J. V. Moloney, P. Ru   +6 more
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Optical propagation through turbulent air

Optics & Laser Technology, 1979
Abstract Turbulent air causes optical rays to deviate from otherwise straight paths by irregular slight undulations, and it also changes the phase velocities irregularly. These fluctuations cause a host of unpleasant degradations to communications signals.
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Optical correlation diagnostics of turbulence

SPIE Proceedings, 1997
Application of the optical correlation method to the studies of structure characteristics of turbulence is considered. The structure function D E ((rho) ) of the dielectric constant is determined by measuring the boundary field transverse coherence function. The experimental results obtained are shown to agree well with the theory.
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Optical propagation through turbulent jets

SPIE Proceedings, 2004
In this work we present results of turbulent effects on the propagation of laser beam through turbulent jets. Several jets were examined, using CFD computations and then the density fluctuations were calculated using several models. The effect of the jet on imaging and on the optical resolution is presented.
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