Results 41 to 50 of about 154,766 (375)

Numerical treatment of the light propagation problem in the post-Newtonian formalism [PDF]

open access: yes, 2009
The geometry of a light wavefront, evolving from a initial flat wavefront in the 3-space associated with a post-Newtonian relativistic spacetime, is studied numerically by means of the ray tracing method.
Miguel, A. San   +2 more
core   +1 more source

Three-dimensional spatiotemporal focusing of holographic patterns

open access: yesNature Communications, 2016
Three-dimensional computer-generated holography cannot be implemented with temporal focusing. Here, Hernandez et al. use two spatial light modulators to control transverse- and axial-target light distribution, generating spatiotemporally focused patterns
Oscar Hernandez   +5 more
doaj   +1 more source

Optical Aberrations and Wavefront

open access: yesTürk Oftalmoloji Dergisi, 2014
The deviation of light to create normal retinal image in the optical system is called aberration. Aberrations are divided two subgroup: low-order aberrations (defocus: spherical and cylindrical refractive errors) and high-order aberrations (coma ...
Nihat Polat   +2 more
doaj   +1 more source

Telescope to Observe Planetary Systems (TOPS): a high throughput 1.2-m visible telescope with a small inner working angle [PDF]

open access: yes, 2006
The Telescope to Observe Planetary Systems (TOPS) is a proposed space mission to image in the visible (0.4-0.9 micron) planetary systems of nearby stars simultaneously in 16 spectral bands (resolution R~20). For the ~10 most favorable stars, it will have
/   +22 more
core   +2 more sources

On-chip wavefront shaping with dielectric metasurface

open access: yesNature Communications, 2019
Metasurfaces can be programmed for a spatial transformation of the wavefront, thus allowing parallel optical signal processing on-chip within an ultracompact dimension.
Zi Wang   +5 more
semanticscholar   +1 more source

Wavefront aberrations in children with myopia and hyperopia before and after cycloplegia

open access: yesРоссийский офтальмологический журнал, 2018
Purpose: a comparative study of the effect of cycloplegia on wavefront aberration in children with myopia and hyperopia. Material and methods. The study involved 20 patients (39 eyes) with myopic refraction (averagely -5.2 ± 1,5 D) and 26 patients (52 ...
E. P. Tarutta   +2 more
doaj   +1 more source

The wavefront of the radio signal emitted by cosmic ray air showers [PDF]

open access: yes, 2014
Analyzing measurements of the LOPES antenna array together with corresponding CoREAS simulations for more than 300 measured events with energy above $10^{17}\,$eV and zenith angles smaller than $45^\circ$, we find that the radio wavefront of cosmic-ray ...
Apel, W. D.   +56 more
core   +3 more sources

Fourier transform-wavefront reconstruction for the pyramid wavefront sensor [PDF]

open access: yes1st AO4ELT conference - Adaptive Optics for Extremely Large Telescopes, 2010
The application of Fourier-transform reconstruction techniques to the pyramid wavefront sensor has been investigated. A preliminary study based on end-to-end simulations of an adaptive optics system with ≈40x40 subapertures and actuators shows that the performance of the Fourier-transform reconstructor (FTR) is of the same order of magnitude than the ...
Quirós-Pacheco, Fernando   +2 more
openaire   +3 more sources

Zernike-coefficient extraction via helical beam reconstruction for optimization (ZEHBRO) in the far field

open access: yesHigh Power Laser Science and Engineering, 2023
The spatial distribution of beams with orbital angular momentum in the far field is known to be extremely sensitive to angular aberrations, such as astigmatism, coma and trefoil. This poses a challenge for conventional beam optimization strategies when a
J. B. Ohland   +6 more
doaj   +1 more source

Radio Positioning With EM Processing of the Spherical Wavefront [PDF]

open access: yesIEEE Transactions on Wireless Communications, 2019
Next 5G and beyond applications have attracted a tremendous interest towards systems using antenna arrays with an extremely large number of antennas where the technology conceived for communication might also be exploited for high-accuracy positioning ...
F. Guidi, D. Dardari
semanticscholar   +1 more source

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