Results 21 to 30 of about 574,892 (287)

Real-time Experimental Demonstrations of a Photonic Lantern Wave-front Sensor

The Astrophysical Journal Letters, 2023
The direct imaging of an Earth-like exoplanet will require sub-nanometric wave-front control across large light-collecting apertures to reject host starlight and detect the faint planetary signal.
Jonathan W. Lin, Michael P. Fitzgerald, Yinzi Xin, Yoo Jung Kim, Olivier Guyon, Barnaby Norris, Christopher Betters, Sergio Leon-Saval, Kyohoon Ahn, Vincent Deo, Julien Lozi, Sébastien Vievard, Daniel Levinstein, Steph Sallum, Nemanja Jovanovic   +14 more
doaj   +1 more source

The Durham Adaptive Optics Simulation Platform (DASP): Current status

SoftwareX, 2018
The Durham Adaptive Optics Simulation Platform (DASP) is a Monte-Carlo modelling tool used for the simulation of astronomical and solar adaptive optics systems.
A.G. Basden, N.A. Bharmal, D. Jenkins, T.J. Morris, J. Osborn, J. Peng, L. Staykov   +6 more
doaj   +1 more source

Astronomical demonstration of an optical vortex coronagraph

Optics Express, 2008
Using an optical vortex coronagraph and simple adaptive optics techniques, we have made the first convincing demonstration of an optical vortex coronagraph that is coupled to a star gazing telescope. We suppressed by 97% the primary star of a resolvable binary system, Cor Caroli. The stars had an angular separation of 1.9lambda/D at our imaging camera.
Grover A, Swartzlander, Erin L, Ford, Rukiah S, Abdul-Malik, Laird M, Close, Mary A, Peters, David M, Palacios, Daniel W, Wilson   +6 more
openaire   +2 more sources

Astronomical Imaging... Atmospheric Turbulence? Adaptive Optics! [PDF]

, 2013
This course/paper deals with adaptive optics in the framework of astronomical imaging. It does not pretend to be an exhaustive course of astronomical adaptive optics.
M. Carbillet, Carbillet, M.
core   +1 more source

Modern Astronomical Optics [PDF]

Nature, 1956
Proceedings of a Symposium on Astronomical Optics and Related Subjects Held in the University of Manchester, April 19th–22nd, 1955. Ed. by Prof. Zdenek Kopal. Pp. xv + 428. (Amsterdam: North-Holland Publishing Co.; New York: Interscience Publishers, Inc., 1956.) 45 guilders; 90s.
openaire   +1 more source

Three-Dimensional Manipulation for Self-Focusing Behavior via the State of Polarization

Frontiers in Physics, 2022
In this work, the controllable self-focusing behavior is first investigated by manipulating the state of polarization (SoP), that is, the phase difference between two polarized components at the initial optical field, which can be used to realize the ...
Lu Lu, Zhiqiang Wang, Zhiqiang Wang, Rong Lin, Yangjian Cai, Yangjian Cai   +5 more
doaj   +1 more source

Task performance in astronomical adaptive optics [PDF]

SPIE Proceedings, 2006
In objective or task-based assessment of image quality, figures of merit are defined by the performance of some specific observer on some task of scientific interest. This methodology is well established in medical imaging but is just beginning to be applied in astronomy.
Harrison H, Barrett, Kyle J, Myers, Nicholas, Devaney, J C, Dainty, Luca, Caucci   +4 more
openaire   +2 more sources

Comparison of beam combiners for a synthetic aperture imaging telescope [PDF]

Journal of the European Optical Society-Rapid Publications, 2006
Future astronomical space missions will comprise a constellation of several optical telescopes to detect exo-planets by interferometric nulling of starlight.
van der Avoort Casper, Pereira Silvania F., Braat Joseph J.M., den Herder Jan-Willem   +3 more
doaj   +1 more source

Research on the Time Drift Stability of Differential Inductive Displacement Sensors with Frequency Output

Sensors, 2022
An edge displacement sensor is one of the key technologies for building large segmented mirror astronomical optical telescopes. A digital interface is one novel approach for sensor technologies, digital transformation and the Internet of Things (IoT) in ...
Xiaolong Lu, Guiyun Tian, Zongwen Wang, Wentao Li, Dehua Yang, Haoran Li, You Wang, Jijun Ni, Yong Zhang   +8 more
doaj   +1 more source

Surface figure metrology for reflective membrane mirrors based on phase-measuring deflectometry

Frontiers in Astronomy and Space Sciences
Reflective membrane mirrors provide a lightweight, low-cost alternative to traditional optics for next-generation large-aperture telescopes, but their non-rigid, thin structure poses challenges for surface metrology.
Xin Yan, Xin Yan, Xin Yan, Zhi-Kang Zhuang, Zhi-Kang Zhuang, Fu-Jia Du, Fu-Jia Du, Wen Duan, Wen Duan, Peilin Yin, Mo-Nong Yu, Guang Yang, Guang Yang   +12 more
doaj   +1 more source