Results 21 to 30 of about 106,212 (345)

Three-dimensional spatiotemporal focusing of holographic patterns

Nature 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, Eirini Papagiakoumou, Dimitrii Tanese, Kevin Fidelin, Claire Wyart, Valentina Emiliani   +5 more
doaj   +1 more source

Demonstrating backflow in classical two beams’ interference

New Journal of Physics, 2022
The well-known interference pattern of bright and dark fringes was first observed for light beams back in 1801 by Thomas Young. The maximum visibility fringes occur when the irradiance of the two beams is equal, and as the ratio of the beam intensities ...
Anat Daniel, Bohnishikha Ghosh, Bernard Gorzkowski, Radek Lapkiewicz   +3 more
doaj   +1 more source

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

1st 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, Correia, Carlos, Esposito, Simone   +2 more
openaire   +3 more sources

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

, 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., Arteaga-Velázquez, J. C., Bekk, K., Bertaina, M., Biermann, P. L., Blümer, J., Bozdog, H., Brancus, I. M., Bähren, L., Cantoni, E., Chiavassa, A., Daumiller, K., De Souza, V., Doll, P., Engel, R., Falcke, H., Fuchs, B., Gemmeke, H., Grupen, C., Haungs, A., Heck, D., Horneffer, A., Huber, D., Huege, T., Hörandel, J. R., Isar, P. G., Kampert, K.-H., Kang, D., Krömer, O., Kuijpers, J., Link, K., LOPES Collaboration, Ludwig, M., Mathes, H. J., Melissas, M., Morello, C., Oehlschläger, J., Palmieri, N., Pierog, T., Pierro, F. D., Rautenberg, J., Rebel, H., Roth, M., Rühle, C., Saftoiu, A., Schieler, H., Schmidt, A., Schoo, S., Schröder, F. G., Sima, O., Toma, G., Trinchero, G. C., Uczak, P., Weindl, A., Wochele, J., Zabierowski, J., Zensus, J. A.   +56 more
core   +3 more sources

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

, 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, Pascual-Sanchez, J. -F., Vicente, F.   +2 more
core   +1 more source

Joint optimization of wavefront sensing and reconstruction with automatic differentiation [PDF]

arXiv, 2022
High-contrast imaging instruments need extreme wavefront control to directly image exoplanets. This requires highly sensitive wavefront sensors which optimally make use of the available photons to sense the wavefront. Here, we propose to numerically optimize Fourier-filtering wavefront sensors using automatic differentiation.
arxiv  

Wavefront-sensing with a thin diffuser [PDF]

Opt. Lett. 42(24) 4117 (2017), 2017
We propose and implement a broadband, compact, and low-cost wavefront sensing scheme by simply placing a thin diffuser in the close vicinity of a camera. The local wavefront gradient is determined from the local translation of the speckle pattern. The translation vector map is computed thanks to a fast diffeomorphic image registration algorithm and ...
arxiv   +1 more source

Shack Hartmann wavefront sensor with array of phase coded masks [PDF]

, 2021
Shack-Hartmann wavefront sensors (SHWS) are generally used to measure the wavefront curvature of light beams. Measurement accuracy and the sensitivity of these sensors are important factors for better wavefront sensing. In this study, we demonstrate a new type of SHWS with better measurement accuracy than the regular SHWS.
arxiv   +1 more source

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

, 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
/, Angel, James R. P., Bowers, Charles, Burge, James, Burrows, Adam, Codona, Johanan, Greene, Thomas, Guyon, Olivier, Iye, Masanori, Kasting, James, Martin, Hubert, McCarthy, Jr., Donald W., Meadows, Victoria, Meyer, Michael, Pluzhnik, Eugene A., Sleep, Norman, Spears, Tony, Tamura, Motohide, Tenerelli, Domenick, Vanderbei, Robert, Woodgate, Bruce, Woodruff, Robert A., Woolf, Neville J.   +22 more
core   +2 more sources

Tissue-Saving Zernike Terms Selection in Customized Treatments for Refractive Surgery

Journal of Optometry, 2009
Purpose: To study the possibility of performing customized refractive surgery minimising the amount of ablated tissue without compromising visual quality.
Samuel Arba-Mosquera, Diego de Ortueta, Jesús Merayo-Lloves   +2 more
doaj   +1 more source