Results 81 to 90 of about 64,627 (124)

Atmospheric Turbulence Phase Reconstruction via Deep Learning Wavefront Sensing

Sensors
The fast and accurate reconstruction of the turbulence phase is crucial for compensating atmospheric disturbances in free-space coherent optical communication. Traditional methods suffer from slow convergence and inadequate phase reconstruction accuracy.
Yutao Liu, Mingwei Zheng, Xingqi Wang
doaj   +1 more source

Multi-frame blind deconvolution using X-ray microscope images of an in-plane rotating sample

Scientific Reports
We propose a multi-frame blind deconvolution method using an in-plane rotating sample optimized for X-ray microscopy, where the application of existing deconvolution methods is technically difficult.
Shinnosuke Kurimoto, Takato Inoue, Hitoshi Aoto, Toshiki Ito, Satsuki Ito, Yoshiki Kohmura, Makina Yabashi, Satoshi Matsuyama   +7 more
doaj   +1 more source

Multi-color Wavefront Sensor using Talbot effect for High-order Harmonic Generation [PDF]

arXiv
We present a novel method for multi-color wavefront measurement of high-order harmonic generation beams using the Talbot effect, validated both theoretically and experimentally for the first time. Each harmonic maintains a unique wavefront and produces an independent set of self-images along the optical axis.We achieved the wavefronts reconstruction of
arxiv  

Single-Shot Phase Diversity Wavefront Sensing in Deep Turbulence via Metasurface Optics [PDF]

arXiv
Free-space optical communication (FSOC) systems offer high-bandwidth and secure communication with minimal capital costs. Adaptive optics (AO) are typically added to these systems to decrease atmospheric channel losses; however, the performance of traditional AO wavefront sensors degrades in long-range, deep turbulence conditions. Alternative wavefront
arxiv  

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Fourier wavefront reconstruction with a pyramid wavefront sensor

Adaptive Optics Systems VI, 2018
Using Fourier methods to reconstruct the phase measured by a wavefront sensor (WFS) can significantly re- duce the number of computations required, as well as easily enable predictive reconstruction methods based on knowledge of the adaptive optics system, atmospheric turbulence and wind profile. Previous work on Fourier re- construction has focused on
Bond, Charlotte, Correia, Carlos, Sauvage, Jean-François, El Hadi, Kacem, Neichel, Benoit, Fusco, Thierry   +5 more
openaire   +3 more sources

Wavefront reconstruction error of Shack-Hartmann wavefront sensors [PDF]

Publications of the Astronomical Society of the Pacific, 1994
We have evaluated the wavefront reconstruction error for Shack-Hartmann wavefront sensors based on a series of simulations for various numbers of subapertures at various levels of measurement error in determining the Hartmann spot centroids. The optimum number of subapertures is derived for a given magnitude reference star in the cases of photon-noise ...
M. Iye, N. Takato, I. Yamaguchi
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Multilcolor Wavefront Reconstruction

Applied Optics, 1967
Two and three primary colors derived from an He-Ne gas laser and an argon gas laser were employed in recording and reconstructing holograms. For the tricolor case it is possible to reconstruct a three-dimensional multicolor image which possesses almost all the natural hues of the original object.
R. J. Fedorowicz, A. A. Friesem
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A Review on Wavefront Reconstruction Methods

2021 4th International Conference on Information Systems and Computer Aided Education, 2021
Turbulence in the atmosphere in nature leads to the change of local optical path. The imaging wavefront of starlight is constantly distorted and the energy is constantly dissipated, which eventually leads to the blurring of telescope imaging and the degradation of resolution.
Kefeng Xu, Ke Wang
openaire   +2 more sources

Wavefront reconstruction photography

Physics Today, 1965
Wavefront reconstruction, or holography, is a fascinating photographic process which is a major departure from conventional photography. In this process, discovered in 1947 by D. Gabor of Imperial College, London, the photosensitive device does not directly record an image of the subject; instead, the electromagnetic waves reflected or scattered from ...
Emmett N. Leith, Juris Upatnieks
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Microscopy by Wavefront Reconstruction*

Journal of the Optical Society of America, 1965
Magnification by the wavefront-reconstruction imaging method is discussed. An analysis is given of the aberrations which arise in this type of imagery. Conditions are derived which lead to aberration-free reconstructions.
Kenneth A. Haines, Emmett N. Leith, Juris Upatnieks   +2 more
openaire   +2 more sources