Results 241 to 250 of about 2,243,893 (300)

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.
Luis Alberto, Carvalho, Jarbas, Castro, Wallace, Chamon, Paulo, Schor   +3 more
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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
exaly   +3 more sources

High-precision wavefront reconstruction from Shack-Hartmann wavefront sensor data by a deep convolutional neural network

Measurement science and technology, 2021
The Shack–Hartmann wavefront sensor (SHWFS) has been widely used for measuring aberrations in adaptive optics systems. However, its traditional wavefront reconstruction method usually has limited precision under field conditions because the weight-of ...
Hu Gu, Ziyun Zhao, Zhi-gao Zhang, Shuo Cao, Jing-jing Wu, Lifa Hu   +5 more
semanticscholar   +1 more source

Lab tests of segment/petal phasing with a pyramid wavefront sensor and a holographic dispersed fringe sensor in turbulence with the Giant Magellan Telescope high contrast adaptive optics phasing testbed

Journal of Astronomical Telescopes Instruments and Systems, 2022
. The Giant Magellan Telescope (GMT) design consists of seven circular 8.4-m diameter mirrors, together forming a single 25.4-m diameter primary mirror. This large aperture and collecting area can help extreme adaptive optics (ExAO) systems such as GMT’s
A. Hedglen, L. Close, S. Haffert, J. Males, M. Kautz, A. Bouchez, R. Demers, F. Quirós-Pacheco, B. Sitarski, O. Guyon, Kyle Van Gorkom, J. Long, J. Lumbres, L. Schatz, K. Miller, A. Rodack, J. Knight   +16 more
semanticscholar   +1 more source

Photonic Lanterns as Wavefront Sensors

Optical Fiber Communication Conference (OFC) 2022, 2022
Photonic lanterns are low-loss mode convertors easily integrated with optical fiber technologies. We present the proof of concept of a focal plane low-order wavefront sensor based on a 19-core multicore photonic lantern and deep learning.
openaire   +2 more sources

Wavefront reconstruction with the cone sensor

2020 35th International Conference on Image and Vision Computing New Zealand (IVCNZ), 2020
Wavefronts of light from celestial objects are aberrated by Earth’s evolving atmosphere, causing images captured by ground-based telescopes to be distorted. The slope of the phase of the wavefront can be estimated by a pyramid wavefront sensor, which subdivides the complex field at the focal plane of the telescope, producing four images of the aperture.
Richard M. Clare, Byron E. Engler, Stephen John Weddell   +2 more
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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
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Holographic wavefront sensors

Quantum Electronics, 2020
Abstract A brief historical review of the first designs of holographic wavefront sensors (WFS’s) and the concepts lying in their basis is presented. The main directions in the development of these sensors are highlighted and considered.
V.Yu. Venediktov, A.V. Gorelaya, G.K. Krasin, S.B. Odinokov, A.A. Sevryugin, E.V. Shalymov   +5 more
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