scholarly journals Real-Time Massively Distributed Multi-object Adaptive Optics Simulations for the European Extremely Large Telescope

2018 ◽  
Author(s):  
Hatem Ltaief ◽  
Ali Charara ◽  
Damien Gratadour ◽  
Nicolas Doucet ◽  
Bilel Hadri ◽  
...  
Keyword(s):  
Real Time ◽  
Adaptive Optics ◽  
Large Telescope

scholarly journals Successful application of PSF-R techniques to the case of the globular cluster NGC 6121 (M 4)

2020 ◽  
Vol 634 ◽  
pp. L5 ◽  
Author(s):  
D. Massari ◽  
A. Marasco ◽  
O. Beltramo-Martin ◽  
J. Milli ◽  
G. Fiorentino ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Globular Cluster ◽  
Hybrid Technique ◽  
Large Telescope ◽  
Point Spread ◽  
Accurate Knowledge ◽  
Viable Solution ◽  
Spread Function ◽  
Astronomical Images ◽  
Proper Analysis

Context. Precise photometric and astrometric measurements on astronomical images require an accurate knowledge of the point spread function (PSF). When the PSF cannot be modelled directly from the image, PSF-reconstruction techniques become the only viable solution. So far, however, their performance on real observations has rarely been quantified. Aims. In this Letter, we test the performance of a novel hybrid technique, called PRIME, on Adaptive Optics-assisted SPHERE/ZIMPOL observations of the Galactic globular cluster NGC 6121. Methods. PRIME couples PSF-reconstruction techniques, based on control-loop data and direct image fitting performed on the only bright point-like source available in the field of view of the ZIMPOL exposures, with the aim of building the PSF model. Results. By exploiting this model, the magnitudes and positions of the stars in the field can be measured with an unprecedented precision, which surpasses that obtained by more standard methods by at least a factor of four for on-axis stars and by up to a factor of two on fainter, off-axis stars. Conclusions. Our results demonstrate the power of PRIME in recovering precise magnitudes and positions when the information directly coming from astronomical images is limited to only a few point-like sources and, thus, paving the way for a proper analysis of future Extremely Large Telescope observations of sparse stellar fields or individual extragalactic objects.

scholarly journals Multiconjugate Adaptive Optics for Astronomy

2018 ◽  
Vol 56 (1) ◽  
pp. 277-314 ◽  
Author(s):  
François Rigaut ◽  
Benoit Neichel
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Phase Reconstruction ◽  
Large Telescope ◽  
Wavefront Sensors ◽  
Error Sources ◽  
New Concepts ◽  
Year 2000 ◽  
Current Systems ◽  
Solar Astronomy

Since the year 2000, adaptive optics (AO) has seen the emergence of a variety of new concepts addressing particular science needs; multiconjugate adaptive optics (MCAO) is one of them. By correcting the atmospheric turbulence in 3D using several wavefront sensors and a tomographic phase reconstruction approach, MCAO aims to provide uniform diffraction limited images in the near-infrared over fields of view larger than 1 arcmin2, i.e., 10 to 20 times larger in area than classical single conjugated AO. In this review, we give a brief reminder of the AO principles and limitations, and then focus on aspects particular to MCAO, such as tomography and specific MCAO error sources. We present examples and results from past or current systems: MAD (Multiconjugate Adaptive Optics Demonstrator) and GeMS (Gemini MCAO System) for nighttime astronomy and the AO system, at Big Bear for solar astronomy. We examine MCAO performance (Strehl ratio up to 40% in H band and full width at half maximum down to 52 mas in the case of MCAO), with a particular focus on photometric and astrometric accuracy, and conclude with considerations on the future of MCAO in the Extremely Large Telescope and post–HST era.

scholarly journals Linear phase retrieval for real-time adaptive optics

2013 ◽  
Vol 8 ◽  
Author(s):  
A. Polo ◽  
A. Haber ◽  
S. F. Pereira ◽  
M. Verhaegen ◽  
H. P. Urbach
Keyword(s):  
Real Time ◽  
Adaptive Optics ◽  
Phase Retrieval ◽  
Linear Phase

scholarly journals Performance of real-time adaptive optics compensation in a turbulent channel with high-dimensional spatial-mode encoding

2020 ◽  
Vol 28 (10) ◽  
pp. 15376
Author(s):  
Jiapeng Zhao ◽  
Yiyu Zhou ◽  
Boris Braverman ◽  
Cong Liu ◽  
Kai Pang ◽  
...  
Keyword(s):  
Real Time ◽  
Adaptive Optics ◽  
High Dimensional ◽  
Spatial Mode

Real time controller for 37-element low-order solar adaptive optics system at 1m new vacuum solar telescope

2012 ◽  
Author(s):  
Lei Zhu ◽  
Naiting Gu ◽  
Shanqiu Chen ◽  
Lanqiang Zhang ◽  
Xiaoyun Wang ◽  
...  
Keyword(s):  
Real Time ◽  
Adaptive Optics ◽  
Solar Telescope ◽  
Adaptive Optics System ◽  
Low Order

Real-time control for Keck Observatory next-generation adaptive optics

2010 ◽  
Author(s):  
Marc Reinig ◽  
Donald Gavel ◽  
Ehsan Ardestani ◽  
Jose Renau
Keyword(s):  
Real Time ◽  
Adaptive Optics ◽  
Next Generation ◽  
Real Time Control ◽  
Time Control

What can be retrieved from adaptive optics real-time data?

2012 ◽  
Author(s):  
J. Kolb ◽  
N. Muller ◽  
E. Aller-Carpentier ◽  
P. Andrade ◽  
J. Girard
Keyword(s):  
Real Time ◽  
Adaptive Optics ◽  
Time Data ◽  
Real Time Data
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