نتایج جستجو برای: light coherence

تعداد نتایج: 463424  

Journal: :Optics letters 2008
Min Xu

An analytical theory for coherent backscattering (CBS) of low-coherence light is presented. An expression linking the CBS profile to the radial distribution of the incoherent backscattered light is derived when the incident light is partially spatially coherent. The backscattered snake light, which has experienced exactly two large-angle scatterings, is taken into account together with the diff...

2002
Qihuang Gong

For a transition Fe = 0 ↔ Fg = 1 driven by a linearly polarized light and probed by a circularly light, quantum coherence effects are investigated. Due to the coherence between the drive Rabi frequency and Zeeman splitting, electromagnetically induced transparency, electromagnetically induced absorption, and the transition from positive to negative dispersion are obtained, as well as the popula...

1998
Kostadinka K. Bizheva Andy M. Siegel David A. Boas

We used low coherence interferometry to measure Brownian motion within highly scattering random media. A coherence gate was applied to resolve the optical path-length distribution and to separate ballistic from diffusive light. Our experimental analysis provides details on the transition from single scattering to light diffusion and its dependence on the system parameters. We found that the tra...

Journal: :Applied optics 2003
Julien Moreau Vincent Loriette Albert-Claude Boccara

A method for measuring birefringence by use of thermal-light polarization-sensitive optical coherence tomography is presented. The use of thermal light brings to polarization-sensitive optical coherence tomography a resolution in the micrometer range in three dimensions. The instrument is based on a Linnik interference microscope and makes use of achromatic quarter-wave plates. A mathematical r...

2011
Michael G. Giacomelli Adam Wax

We present an imaging system based on low coherence interferometric detection of multiply scattered light for extended depth imaging into highly scattering media. By incorporating angle-resolved detection, coherence imaging with multiply scattered photons is shown to be both feasible and potentially superior to existing techniques for performing time-resolved measurements of scattered light. Im...

1998
Gavin S. P. Miller Steven M. Rubin Dulce B. Ponceleon

This paper describes a series of algorithms that allow the unconstrained walkthrough of static scenes shaded with the results of precomputed global illumination. The global illumination includes specular as well as diffuse terms, and intermediate results are cached as surface light fields. The compression of such light fields is examined, and a lazy decompression scheme is presented which allow...

Journal: :Optics letters 2006
Young L Kim Prabhakar Pradhan Min H Kim Vadim Backman

We experimentally study the propagation of circularly polarized light in the subdiffusion regime by exploiting enhanced backscattering [(EBS), also known as coherent backscattering] of light under low spatial coherence illumination. We demonstrate for the first time, to the best of our knowledge, that a circular polarization memory effect exists in EBS over a large range of scatterers' sizes in...

Journal: :Optics letters 2006
Young L Kim Prabhakar Pradhan Hariharan Subramanian Yang Liu Min H Kim Vadim Backman

The origin of low-coherence enhanced backscattering (EBS) of light in random media when the spatial coherence length of illumination is much smaller than the transport mean free path has been poorly understood. We report that in weakly scattering discrete random media low-coherence EBS originates from time-reversed paths of double scattering. Low spatial coherence illumination dephases the time...

2015
Jǐrí Svozilík Jan Peřina Juan P. Torres

Anderson localization and partially coherent light are at first sight unrelated, if one thinks in terms of interference. However, Anderson localization can be observed with non-coherent light, since a partially coherent beam can be viewed as a superposition of randomly phased components, which localize independently in a disordered media [1]. This gives rise to the question of how much transver...

2003
Julián Chaubell Florian Gstrein

Optical coherence tomography (OCT) is a non-invasive imaging technique based on the use of light sources exhibiting a low degree of coherence. Low coherence interferometric microscopes have been successful in producing internal images of thin pieces of biological tissue; typically samples of the order of 1 mm in depth have been imaged, with a resolution of the order of 10 to 20 μm in some porti...

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