Results 261 to 270 of about 44,477 (288)

Miniaturized wavefront sensors for MOAO

Adaptive Optics: Analysis and Methods/Computational Optical Sensing and Imaging/Information Photonics/Signal Recovery and Synthesis Topical Meetings on CD-ROM, 2007
The original concept of multi-object AO requires wavefront sensors laying in the focal plane of telescopes. Our approach is based on a miniaturized Shack-Hartmann head including fibers transporting light from the focal plane towards detection.
Chemla, Fanny, Gendron, Éric, Guinouard, Isabelle, Cornu, Florence, Jagourel, Pascal   +4 more
openaire   +2 more sources

CIAO: wavefront sensors for GRAVITY

SPIE Proceedings, 2016
GRAVITY is a second generation near-infrared VLTI instrument that will combine the light of the four unit or four auxiliary telescopes of the ESO Paranal observatory in Chile. The major science goals are the observation of objects in close orbit around, or spiraling into the black hole in the Galactic center with unrivaled sensitivity and angular ...
Scheithauer, Silvia, Brandner, Wolfgang, Deen, Casey P., Adler, Tobias, Bonnet, Henri, Bourget, P., Chemla, Fanny, Clénet, Yann, Delplancke, Francoise, Ebert, Monica, Eisenhauer, Frank, Esselborn, Michael, Finger, Gert, Gendron, Éric, Glauser, Adrian M., Gonté, Frédéric, Henning, Thomas, Hippler, Stefan, Huber, Armin, Hubert, Zoltan, Jakob, Gerd, Jochum, Lieselotte, Jocou, Laurent, Kendrew, Sarah, Klein, Ralf, Kolb, Johann, Kulas, Martin, Laun, Werner, Lenzen, Rainer, Mellein, Marcus, Müller, Eric, Moreno-Ventas, Javier, Neumann, Udo, Oberti, Sylvain, Ott, Jürgen, Pallanca, Laurent, Panduro, Johana, Ramos, José Ricardo, Riquelme, Miguel, Rohloff, Ralf-Rainer, Rousset, Gérard, Schuhler, Nicolas, Suarez, Marcos, Zins, Gerard   +43 more
openaire   +3 more sources

Modal sensor of wavefront

SPIE Proceedings, 2003
The method of reconstruction of wavefront modes such as the Hartmann one is considered. Complete data about modes using magnification of number of measured numerical performances of the image created by each of them, not using magnification of number of the subapertures is offered.
Anatolii V. Makhan'ko, Sergei M. Chernyavskii, Alexandr Chernyavskii, Gennadii Degtyarev   +3 more
openaire   +2 more sources

Hybrid wavefront sensor for the fast detection of wavefront disturbances

Applied Optics, 2012
Strongly aberrated wavefronts lead to inaccuracies and nonlinearities in holography-based modal wavefront sensing (HMWS). In this contribution, a low-resolution Shack-Hartmann sensor (LRSHS) is incorporated into HMWS via a compact holographic design to extend the dynamic range of HMWS.
Wolfgang Osten, Tobias Haist, Shihao Dong   +2 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
openaire   +1 more source

A New Wavefront Sensor With Polar Symmetry: Quantitative Comparisons With a Shack-Hartmann Wavefront Sensor

Journal of Refractive Surgery, 2006
ABSTRACT PURPOSE: A novel wavefront sensor has been developed. It follows the same principle of the Shack-Hartmann wavefront sensor in that it is based on slope information. However, it has a different symmetry, which may offer benefits in terms of application.
Paulo Schor, Wallace Chamon, J.C. Castro, Luis Alberto Vieira de Carvalho   +3 more
openaire   +3 more sources

Automatic Wavefront Error Sensor

Applied Optics, 1973
The automatic wavefront error sensor has been developed for determining the wavefront error of an optical system. The instrument, which provides a null test for a parabola, measures the ray intercept error and automatically converts this to a wavefront error. Both the ray fan plot and the wavefront error curve are plotted simultaneously.
openaire   +3 more sources

Tomographic diffractive microscopy with a wavefront sensor

Optics Letters, 2012
Tomographic diffractive microscopy is a recent imaging technique that reconstructs quantitatively the three-dimensional permittivity map of a sample with a resolution better than that of conventional wide-field microscopy. Its main drawbacks lie in the complexity of the setup and in the slowness of the image recording as both the amplitude and the ...
Ruan, Y., Bon, P., Mudry, E., Maire, G., Chaumet, P., Giovannini, H., Belkebir, K., Talneau, A., Wattellier, B., Monneret, S., Sentenac, A.   +10 more
openaire   +4 more sources

Wavefront reconstruction for the Shack-Hartmann wavefront sensor

SPIE Proceedings, 2002
The Shack-Hartmann wavefront sensor is a powerful tool for optical analysis. A vital step in the data analysis chain involves reconstructing the wavefront incident upon the lenslet array from hundreds or thousands of slope measurements. We discuss here the basics of reconstruction and the differences in reconstruction for the case of Hartmann and Shack-
openaire   +2 more sources

A fast wavefront reconstructor for the nonlinear curvature wavefront sensor

Adaptive Optics Systems VI, 2018
The Nonlinear Curvature Wavefront Sensor (nlCWFS), first proposed by Guyon, determines wavefront shape from images of a reference beacon in a number of planes between the pupil and focal plane of a telescope. We describe a new algorithm that rapidly recovers the low-order aberrations accurately enough to allow practical use of the nlCWFS in an adaptive
Johanan L. Codona, Michael Hart, Mala Mateen   +2 more
openaire   +2 more sources