Explanipedia

HARMONI at ELT: project status and instrument overview Open

Niranjan Thatte, Dave Melotte, Benoît Neichel, D. Le Mignant, Philip Rees , et al. · 2024

International audience

Adaptive optics telemetry standard Open

Tiago Gomes, Carlos M. Correia, Lisa Bardou, Sylvain Cetre, Johann Kolb , et al. · 2024

Context . The amount of adaptive optics (AO) telemetry generated by visible/near-infrared ground-based observatories is ever greater, leading to a growing need for a standardised data exchange format to support performance analysis, AO res…

A comparison of next-generation turbulence profiling instruments at Paranal Open

Ryan Griffiths, Lisa Bardou, T. Butterley, James Osborn, Richard Wilson , et al. · 2024

A six-night optical turbulence monitoring campaign has been carried at Cerro Paranal observatory in 2023 February and March to facilitate the development and characterization of two novel atmospheric site monitoring instruments – the ring-…

Adaptive Optics Telemetry Standard: Design and specification of a novel data exchange format Open

Tiago Gomes, Carlos Correia, Lisa Bardou, Sylvain Cetre, Johann Kolb , et al. · 2023

The amount of Adaptive Optics (AO) telemetry generated by VIS/NIR ground-based observatories is ever greater, leading to a growing need for a standardised data exchange format to support performance analysis and AO research and development…

Continuous daytime and nighttime forecast of atmospheric optical turbulence from numerical weather prediction models Open

Florian Quatresooz, Ryan Griffiths, Lisa Bardou, Richard Wilson, James Osborn , et al. · 2023

Future satellite-to-ground optical communication systems will benefit from accurate forecasts of atmospheric optical turbulence; namely for site selection, for the routing and the operation of optical links, and for the design of optical c…

Estimating the ELT's Differential Pistons with Deep Learning Open

Charleston Chauvet, Morgan Gray, Benoît Neichel, Maxime Dumont, Lisa Bardou , et al. · 2023

High angular resolution requires large telescope apertures, which in turn often require segmented pupils. This is particularly true for large optical and infrared ground-based telescopes such as the Extremely Large Telescope (ELT). Due to …

Design and prototyping of HARMONI's light-injection module for AO calibrations Open

Noah Schwartz, Kjetil Dohlen, Kacem El Hadi, Emre Karacar, Jean-François Sauvage , et al. · 2023

In this paper, we present the design of the Adaptive Optics Calibration Unit (AOCU) of the HARMONI instrument, focusing on the light-injection module. We present theoretical photometric budget and evaluate experimental performance in the l…

MKID: an energy sensitive superconducting detector for the next generation of XAO systems Open

Aurélie Magniez, Lisa Bardou, Tim Morris, K. O’Brien · 2022

Selected for the next generation of adaptive optics (AO) systems, the pyramid\nwavefront sensor (PWFS) is recognised for its closed AO loop performance. As\nnew technologies are emerging, it is necessary to explore new methods to\nimprove …

Towards virtual access of adaptive optics telemetry data Open

Tiago Gomes, Carlos Correia, Lisa Bardou, Olivier Beltramo-Martin, Thierry Fusco , et al. · 2022

International audience

HARMONI at ELT: overview of the capabilities and expected performance of the ELT's first light, adaptive optics assisted integral field spectrograph. Open

Niranjan Thatte, Dave Melotte, Benoît Neichel, D. Le Mignant, Ian Bryson , et al. · 2022

International audience

Towards virtual access of adaptive optics telemetry data Open

Tiago Gomes, Carlos Correia, Lisa Bardou, Olivier Beltramo-Martin, Thierry Fusco , et al. · 2022

Large amounts of Adaptive-Optics (AO) control loop data and telemetry are currently inaccessible to end-users. Broadening access to those data has the potential to change the AO landscape on many fronts, addressing several use-cases such a…

HARMONI at ELT: adaptive optics calibration unit from design to prototyping Open

Noah Schwartz, Edgard Renault, William Ceria, Martin Black, Kjetil Dohlen , et al. · 2022

International audience

First stellar photons for an integrated optics discrete beam combiner at the William Herschel Telescope Open

Abani Shankar Nayak, Lucas Labadie, Tarun Sharma, Simone Piacentini, Giacomo Corrielli , et al. · 2021

We present the first on-sky results of a four-telescope integrated optics discrete beam combiner (DBC) tested at the 4.2 m William Herschel Telescope. The device consists of a four-input pupil remapper followed by a DBC and a 23-output ref…

ELT-scale elongated LGS wavefront sensing: on-sky results Open

Lisa Bardou, É. Gendron, Gérard Rousset, ‪Damien Gratadour‬, Alastair Basden , et al. · 2021

Context. Laser guide stars (LGS) allow adaptive optics (AO) systems to reach greater sky coverage, especially for AO systems correcting the atmospheric turbulence on large fields of view. However LGS suffer from limitations, among which is…

Diffraction-limited integral-field spectroscopy for extreme adaptive optics systems with the multicore fiber-fed integral-field unit Open

Sebastiaan Y. Haffert, Robert J. Harris, Alessio Zanutta, Fraser A. Pike, Andrea Bianco , et al. · 2020

Direct imaging instruments have the spatial resolution to resolve exoplanets from their host star. This enables direct characterization of the exoplanets atmosphere, but most direct imaging instruments do not have spectrographs with high e…

The ORP on-sky community access program for adaptive optics instrumentation development Open

Tim Morris, James Osborn, Marcos Reyes, I. Montilla, G. Rousset , et al. · 2020

International audience

First on-sky results of the CAWS wavefront sensor on the CANARY experiment Open

Nicolás Dubost, Nazim A. Bharmal, M. Langlois, Magali Loupias, Clément Schott , et al. · 2020

International audience

Diffraction-limited integral-field spectroscopy for extreme adaptive\n optics systems with the Multi-Core fiber-fed Integral-Field Unit Open

Sebastiaan Y. Haffert, Robert J. Harris, Alessio Zanutta, Fraser A. Pike, Andrea Bianco , et al. · 2020

Direct imaging instruments have the spatial resolution to resolve exoplanets\nfrom their host star. This enables direct characterization of the exoplanets\natmosphere, but most direct imaging instruments do not have spectrographs with\nhig…

On-sky results for adaptive optics control with data-driven models on low-order modes Open

Baptiste Sinquin, Léonard Prengère, Caroline Kulcsár, Henri-François Raynaud, É. Gendron , et al. · 2020

Dedicated tip–tilt loops are commonly implemented on adaptive optics (AO) systems. In addition, a number of recent high-performance systems feature tip–tilt controllers that are more efficient than the integral action controller. In this c…

Wavefront prediction using artificial neural networks for open-loop adaptive optics Open

Xuewen Liu, Tim Morris, Chris Saunter, Francisco Javier de Cos Juez, Carlos González-Gutiérrez , et al. · 2020

Latency in the control loop of adaptive optics (AO) systems can severely limit performance. Under the frozen flow hypothesis linear predictive control techniques can overcome this; however, identification and tracking of relevant turbulent…

Data-based modelling of low-order modes for AO control: what do on-sky experiments tell us ? Open

Baptiste Sinquin, Caroline Kulcsár, Léonard Prengère, Henri‐François Raynaud, É. Gendron , et al. · 2019

It is well-known that data-driven models for the tip-tilt modes significantly improve the performance of Adaptive Optics (AO) systems as it allows to compensate for vibration-induced disturbances. Whether identifying from data the temporal…

Elongated laser guide star wavefront sensing for the ELT adaptive optics systems Open

Lisa Bardou · 2018

L’ELT (Extremely Large Telescope), est un télescope de diamètre 39 m en cours de réalisation par l’Observatoire Européen Austral (ESO). Pour pouvoir tirer pleinement parti de sa taille, ses instruments seront équipés de systèmes d’Optique …

Analyse de front d'onde sur étoile laser allongée pour l'optique adaptative de l'ELT Open

Lisa Bardou · 2018

The ELT (Extremely Large Telescope) is a telescope whose diameter is 39 m currently under construction by the European Southern Observatory (ESO). In order to fully benefit from its size, ELT instruments will be equipped with Adaptive Opti…

On-sky demonstration of matched filters for wavefront measurements using ELT-scale elongated laser guide stars Open

Alastair Basden, Lisa Bardou, Domenico Bonaccini Calia, Tristan Buey, Mauro Centrone , et al. · 2017

The performance of adaptive optics systems is partially dependent on the algorithms used within the real-time control system to compute wavefront slope measurements. We demonstrate the use of a matched filter algorithm for the processing o…

Preliminary on-sky results of the CANARY experiment with an ELT-elongated sodium LGS Open

Lisa Bardou, Ã‰ric Gendron, G. Rousset, ‪Damien Gratadour‬, Alastair Basden , et al. · 2017

We present on-sky results of wavefront sensing on an elongated LGS. These results are derived from observations made with the multi-object AO demonstrator CANARY on the William Herschel Telescope (WHT) in La Palma. The laser guide star is …

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