Results 261 to 270 of about 365,427 (304)

Achieving spatial superresolution with engineered spatial modes

Physica Scripta, 2023
Abstract Rayleigh’s criterion sets a limit on the minimum separation between two incoherent point sources to be resolved into distinct objects. However, superresolution techniques have been developed to circumvent Rayleigh’s criterion. These techniques mainly deal with single parameter estimation and require prior information about the ...
Jerin A Thachil, B Ramanan, Ashok Kumar
openaire   +1 more source

Six Spatial Modes Photonic Lanterns

Optical Fiber Communication Conference, 2015
Low-loss all-fiber mode selective photonic-lanterns capable of exciting six spatial fiber modes (4 LP modes) are demonstrated. Mode field profile characterization of photonic lanterns using both step and graded index fibers is presented.
A. M. Velazquez-Benitez, Juan Carlos Alvarado-Zacarias, Gisela Lopez-Galmiche, Jose Enrique Antonio-Lopez, Axel Schülzgen, Dennis Van Ras, Pierre Sillard, Chigo Okonkwo, Rodrigo Amezcua Correa   +8 more
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Determining spatial modes of lasers with spatial coherence measurements

Applied Optics, 2000
We explain a technique that extracts both the structure and the modal weights of spatial modes of lasers by analyzing the spatial coherence of the beam. This is the first time, to our knowledge, that an experimental method is being used to measure arbitrary forms of the spatial modes. We applied this method to an edge-emitting Fabry-Perot semiconductor
C M, Warnky, B L, Anderson, C A, Klein
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Monolithic mode separator for the first-order spatial mode of light field

Applied Optics, 2022
We propose a monolithic mode separator (MS) for the first-order spatial mode of a light field. The principle of the MS is an asymmetric Mach–Zehnder interferometer, which consists of two non-polarizing beam splitters, a right-angle prism, and a pentagonal prism. These optics are glued together as a monolithic one.
Hailiang Gong, Qing Fan, Hai He, Gang Li, Pengfei Zhang, Tiancai Zhang   +5 more
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Spatial mode sorter coronagraphs

14th Pacific Rim Conference on Lasers and Electro-Optics (CLEO PR 2020), 2020
We discuss the use of spatial mode sorters as coronagraphs capable of operating near the fundamental limits at small inner working angles.
Carpenter, Joel, Fontaine, Nicolas K., Norris, Barnaby R. M., Leon-Saval, Sergio   +3 more
openaire   +3 more sources

Spatial and Temporal Structure of Edge-Localized Modes

Physical Review Letters, 2004
This Letter provides information on the spatial and temporal structure of periodic eruptions observed in magnetically confined laboratory fusion plasmas, called edge-localized modes (ELMs), and highlights similarities with solar eruptions. Taken together, the observations presented in this Letter provide strong evidence for ELMs being associated with a
Kirk, A., Wilson, H.R., Counsell, G.F., Akers, R., Arends, E., Cowley, S.C., Dowling, J., Lloyd, B., Price, M., Walsh, M.   +9 more
openaire   +3 more sources

Spatial Modes in Periodically Inhomogeneous Media

International Applied Mechanics, 2005
The author discusses an approach to construction of wave modes in periodically inhomogeneous media. Quantitative results are analysed which were obtained for longitudinal waves across the structure in the first four transmitting zones for the medium formed by periodic repetition of two isotropic layers.
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Sources with spatially sinusoidal modes

Optics Communications, 1991
Abstract Optical sources whose cross-spectral density can be expanded into spatially sinusoidal modes are investigated. It is shown that the corresponding cross-spectral density can be constructed by means of a function of a single variable, called the mother function.
De Santis P, Gori F, SANTARSIERO, Massimo, Guattari G.   +3 more
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Spatial Entanglement and Efficient Coupling to Single Spatial Modes

Conference on Coherence and Quantum Optics, 2007
Single-mode coupling efficiency of photons produced via spontaneous parametric down-conversion is limited by entanglement in the photons' spatial degree of freedom. Results are presented illustrating the relationship between pump divergence and the photons' spatial entanlglement.
Warren P. Grice, Ryan S. Bennink, Douglas S. Goodman, Andrew T. Ryan   +3 more
openaire   +1 more source

Optimization of spatial aperture-sampled mode multiplexer for a few mode fiber

2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, 2012
An optimization procedure for spatial mode multiplexing from individual single mode fibers into a few mode fiber based on a spatial aperture sampling concept has been developed. By placing space-variant imaging elements between the single mode and few mode fibers, each beam aperture can be shaped for lower loss coupling and low mode dependent losses ...
M. Blau, D. M. Marom
openaire   +1 more source