Results 41 to 50 of about 239,453 (286)

Research on a Decoupling Algorithm for the Dual-Deformable-Mirrors Correction System

Applied Sciences, 2023
Wavefront distortion caused by atmospheric turbulence can be described as different types of aberrations, such as piston, tilt, defocusing, astigmatism, coma and so on.
Jingyuan Liang, Hairong Wang, Meimiao Han, Xizheng Ke   +3 more
doaj   +1 more source

On-sky wide field adaptive optics correction using multiple laser guide stars at the MMT [PDF]

, 2008
We describe results from the first astronomical adaptive optics system to use multiple laser guide stars, located at the 6.5-m MMT telescope in Arizona. Its initial operational mode, ground-layer adaptive optics (GLAO), provides uniform stellar wavefront
Baranec, Baranec, Baranec, Baranec, Boccas, Casali, Christoph Baranec, Craig Kulesa, Don McCarthy, Egner, Ellerbroek, Freed, Gavel, Georges, Gilmozzi, Hinz, Keith Powell, Lloyd-Hart, Lloyd-Hart, Lloyd-Hart, Lloyd-Hart, Marchetti, Martin, McCarthy, Michael Hart, Miguel Snyder, Milton, N. Mark Milton, Pickering, Putnam, Rigaut, Stalcup, Szeto, Thomas Stalcup, Tokovinin, Vaitheeswaran, Velur, Verin, Vidhya Vaitheeswaran, Wildi, Wizinowich   +40 more
core   +2 more sources

Adaptive wavefront correction of dynamic multimode beam based on modal decomposition [PDF]

Opt. Express 27, 13793-13802 (2019), 2019
We propose and demonstrate a method for the adaptive wavefront correction of dynamic multimode fiber beams for the first time. The wavefront of incident beam is reconstructed in real-time based on the complete modal information, which obtained by using the modal decomposition of correlation filter method.
arxiv   +1 more source

Wavefront Distortion Correction for the Non-Uniform-Intensity Light Based on Extreme Learning Machine

IEEE Photonics Journal, 2021
This paper aims to employ a neural network method of extreme learning machine to solve the problem of laser beam cleanup under the dynamic non-uniform-intensity distribution.
Haiqi Lin, Xing He, Shuai Wang, Ping Yang   +3 more
doaj   +1 more source

Limitations of the ocular wavefront correction with contact lenses

Vision Research, 2009
We analyze theoretically, by means of both computer simulations and laboratory experiments, the limitations of correcting aberrations with ideal customized contact lenses. Four experiments are presented: In the first one, we have analyzed the limitations of a static correction on the dynamic wavefront.
José Francisco Castejón-Mochón, Norberto López-Gil, Vicente Fernández-Sánchez   +2 more
openaire   +3 more sources

FALCON: a concept to extend adaptive optics corrections to cosmological fields [PDF]

, 2004
FALCON is an original concept for a next generation spectrograph at ESO VLT or at future ELTs. It is a spectrograph including multiple small integral field units (IFUs) which can be deployed within a large field of view such as that of VLT/GIRAFFE.
, , Arnaud Liotard, Eric Gendron, Francois F. Assemat, Francois Hammer, Frederic Sayede, Frederic Zamkotsian, Mathieu Puech, Michel Marteaud, Philippe Laporte   +10 more
core   +4 more sources

Keeping development on time: Insights into post‐transcriptional mechanisms driving oscillatory gene expression during vertebrate segmentation

WIREs RNA, Volume 14, Issue 1, January/February 2023., 2023
Genetic oscillators play crucial roles in development. The hairy/Enhancer of split gene family (Hes/her) undergo cell‐autonomous genetic oscillations to regulate the timing of vertebrate segmentation and neural cell proliferation and differentiation. mRNA stability and translation are tightly regulated to maintain oscillatory expression.
Monica C. Blatnik, Thomas L. Gallagher, Sharon L. Amacher   +2 more
wiley   +1 more source

Fully refractive adaptive optics fluorescence microscope using an optofluidic wavefront modulator [PDF]

Opt. Express 28.7 (2020) 9944-9956, 2020
Adaptive optics (AO) is a powerful image correction technique with proven benefits for many life-science microscopy methods. However, the complexity of adding a reflective wavefront modulator and a wavefront sensor into already complicated microscope has made AO prohibitive for its widespread adaptation in microscopy systems. We present here the design
arxiv   +1 more source

Data‐driven modeling and control of an X‐ray bimorph adaptive mirror

Journal of Synchrotron Radiation, Volume 30, Issue 1, Page 57-64, January 2023., 2023
A framework for data‐driven characterization of the nonlinear dynamics of a piezo‐bimorph adaptive X‐ray mirror has been developed. Rapid surface shape control and stability to within 2 nm RMS have been demonstrated.Adaptive X‐ray mirrors are being adopted on high‐coherent‐flux synchrotron and X‐ray free‐electron laser beamlines where dynamic phase ...
Gautam Gunjala, Antoine Wojdyla, Kenneth A. Goldberg, Zhi Qiao, Xianbo Shi, Lahsen Assoufid, Laura Waller   +6 more
wiley   +1 more source

Atmospheric Turbulence Aberration Correction Based on Deep Learning Wavefront Sensing

Sensors, 2023
In this paper, research was conducted on Deep Learning Wavefront Sensing (DLWS) neural networks using simulated atmospheric turbulence datasets, and a novel DLWS was proposed based on attention mechanisms and Convolutional Neural Networks (CNNs).
Jiang You, Jingliang Gu, Yinglei Du, Min Wan, Chuanlin Xie, Zhenjiao Xiang   +5 more
doaj   +1 more source