Explanipedia

Deployed quantum key distribution network: further, longer and more users Open

Yoann Pelet, Nathaniel A. Raymond, Julien Chabé · 2025

Entanglement-based quantum links are the backbone of future quantum internet networks, enabling secure communication between distant cities. Realizing such networks requires addressing multiple practical challenges in long-distance quantum…

In-orbit test results of a free space optical satellite link between a CubeSat-compatible laser communication terminal and MeO ground station Open

Kristiaan Broekens, M. Aimar, É. Aristidi, Géraldine Artaud, Dick de Bruijn , et al. · 2025

Optical links with a duration of 5 minutes have been established between CubeCAT, an in-orbit CubeSat-compatible laser terminal and MeO, the Metrology and Optics Telescope in Grasse, Côte d’Azure. In total 3 links have been established bet…

Searching for large dark matter clumps using the Galileo Satnav clock variations Open

Bruno Bertrand, Pascale Defraigne, Aurélien Hees, A. S. Sheremet, Clément Courde , et al. · 2024

This study presents bounds on transient variations of fundamental constants, with typical timescales ranging from minutes to months, using clocks in space. The underlying phenomenology describing such transient variations relies on models …

Intensity Interferometry Observations of the Hα Envelope of γCas with MéO and a Portable Telescope Open

Nolan Matthews, Jean‐Pierre Rivet, David Vernet, Mathilde Hugbart, G. Labeyrie , et al. · 2023

We report on observations of the extended environment of the bright Be star γ -Cas performed using intensity interferometry measurements within its H α emission line. These observations were performed using a modified version of the I2C in…

Intensity Interferometry observations of the H$α$ envelope of $γ$ Cas with MéO and a portable telescope Open

Nolan Matthews, Jean‐Pierre Rivet, David Vernet, Mathilde Hugbart, G. Labeyrie , et al. · 2023

We report on observations of the extended environment of the bright Be star $γ$-Cas performed using intensity interferometry measurements within its H$α$ emission line. These observations were performed using a modified version of the I2C …

Demonstration of deep-space synchronous two-way laser ranging with a laser transponder aboard Hayabusa2 Open

Hirotomo Noda, Hiroki Senshu, Toshimichi Otsubo, Hiroshi Takeuchi, Clément Courde , et al. · 2023

CATS: turbulence measurement and forecasting Open

Christophe Giordano, Aziz Ziad, É. Aristidi, Julien Chabé, Yan Caujolle , et al. · 2023

The atmospheric turbulence measurement is an essential information for high-angular resolution imaging in astronomy, and for optical link. Since 2015, the Calern Atmospheric Turbulence Station (CATS) monitors atmospheric conditions at the …

Intensity interferometry at Calern and beyond: progress report Open

Nolan Matthews, Jean‐Pierre Rivet, Mathilde Hugbart, G. Labeyrie, Robin Kaiser , et al. · 2022

We present the current status of the I2C stellar intensity interferometer\nused towards high angular resolution observations of stars in visible\nwavelengths. In these proceedings, we present recent technical improvements to\nthe instrumen…

Revival of intensity interferometry with modern photonic technologies Open

William Guerin, J. -P. Rivet, Mathilde Hugbart, F. Vakili, E. S. G. de Almeida , et al. · 2021

We present our project on the revival of intensity interferometry with modern photonic technologies, and more specifically with conventional optical telescopes. This original approach is complementary to the work currently done aiming at a…

CATS: continuous turbulence characterization station for both optical link and astronomical support Open

Carmine Giordano, A. Ziad, É. Aristidi, Julien Chabé, Yan Fantéï-Caujolle , et al. · 2021

International audience

Optical bench development for laser communication OSIRIS mission at Grasse (France) station Open

Duy‐Hà Phung, Étienne Samain, Julien Chabé, Clément Courde, Nicolas Maurice , et al. · 2021

International audience

SPECTRAL MULTIPLEXING IN INTENSITY INTERFEROMETRY Open

Olivier Lai, G. Labeyrie, William Guerin, F Vakili, Robin Kaiser , et al. · 2021

International audience

Constraining velocity-dependent Lorentz and violations using lunar laser ranging Open

Adrien Bourgoin, S. Bouquillon, Aurélien Hees, C. Le Poncin-Lafitte, Quentin G. Bailey , et al. · 2021

International audience

Extending Science from Lunar Laser Ranging Open

Vishnu Viswanathan, E. Mazarico, Stephen Merkowitz, J. G. Williams, Slava G. Turyshev , et al. · 2021

The Lunar Laser Ranging (LLR) experiment has accumulated 50 years of range data of improving accuracy from ground stations to the laser retroreflector arrays (LRAs) on the lunar surface. The upcoming decade offers several opportunities to …

Which isoplanatic patch size for high angular resolution techniques? Open

Aziz Ziad, É. Aristidi, Julien Chabé, Yan Fantéï-Caujolle, Catherine Renaud , et al. · 2020

International audience

Statistical learning as a new approach for optical turbulence forecasting Open

Christophe Giordano, Alohotsy Rafalimanana, Aziz Ziad, É. Aristidi, Julien Chabé , et al. · 2020

International audience

Monitoring the atmospheric turbulence profile with high vertical resolution with the PML instrument Open

Julien Chabé, É. Aristidi, Aziz Ziad, Yan Fantéï-Caujolle, H. Lantéri , et al. · 2020

International audience

Contribution of statistical site learning to improve optical turbulence forecasting Open

Carmine Giordano, Alohotsy Rafalimanana, A. Ziad, É. Aristidi, Julien Chabé , et al. · 2020

The forecast for atmospheric and turbulence conditions above astronomical observatories is of interest to the astronomical community because it allows observations to be planned with maximum efficiency, a process called flexible scheduling…

First two-way laser ranging to a lunar orbiter: infrared observations from the Grasse station to LRO’s retro-reflector array Open

E. Mazarico, Xiaoli Sun, Jean‐Marie Torre, Clément Courde, Julien Chabé , et al. · 2020

First two-way laser ranging to a lunar orbiter: infrared observations from the Grasse station to LRO’s retro-reflector array Open

E. Mazarico, Xiaoli Sun, Jean‐Marie Torre, Clément Courde, Julien Chabé , et al. · 2020

Histoire de la Télémétrie laser terre-lune Open

Julien Chabé, Adrien Bourgoin, Nicolas Rambaux · 2020

Fin des années 1950, sous l’initiative de R.H. Dicke, la mesure télémétrique Terre-Lune fut initialement pensée pour tester la théorie de la Relativité Générale (RG) au travers de la variation de la constante gravitationnelle et du princip…

Recent Progress in Lunar Laser Ranging at Grasse Laser Ranging Station Open

Julien Chabé, Clément Courde, Jean‐Marie Torre, S. Bouquillon, Adrien Bourgoin , et al. · 2020

Based on a fully passive space segment, the lunar laser ranging experiment is the last of the Apollo Lunar Surface Experiments Package to operate. Observations from the Grasse lunar laser ranging station have been made on a daily basis sin…

Monitoring daytime and nighttime optical turbulence profiles with the\n PML instrument Open

É. Aristidi, Aziz Ziad, Yan Fantéï-Caujolle, Julien Chabé, Christophe Giordano , et al. · 2020

The Profiler of Moon Limb is a recent instrument dedicated to the monitoring\nof optical turbulence profile of the atmosphere. Fluctuations of the Moon or\nthe Sun limb allow to evaluate the index refraction structure constant C_n^2(h)\nan…

Monitoring daytime and nighttime optical turbulence profiles with the PML instrument Open

É. Aristidi, Aziz Ziad, Yan Fantéï-Caujolle, Julien Chabé, Christophe Giordano , et al. · 2020

The Profiler of Moon Limb is a recent instrument dedicated to the monitoring of optical turbulence profile of the atmosphere. Fluctuations of the Moon or the Sun limb allow to evaluate the index refraction structure constant C_n^2(h) and t…

On the isoplanatic patch size in High Angular Resolution Techniques Open

A. Ziad, É. Aristidi, Julien Chabé, J. Borgnino · 2019

International audience

A generalized differential image motion monitor Open

É. Aristidi, A. Ziad, Julien Chabé, Yan Fantéï-Caujolle, Catherine Renaud , et al. · 2019

We present the Generalised Differential Image Motion Monitor. It is a compact instrument dedicated to measure 4 parameters of the optical turbulence: seeing, isoplanatic angle, coherence time and wavefront coherence outer scale. GDIMM is b…

Turbulence monitoring at the Plateau de Calern with the GDIMM instrument Open

É. Aristidi, Yan Fantéï-Caujolle, Julien Chabé, Catherine Renaud, Aziz Ziad , et al. · 2018

International audience

CATS: a new station for a complete characterization of atmospheric turbulence Open

Aziz Ziad, Julien Chabé, Yan Fantéï-Caujolle, É. Aristidi, Catherine Renaud · 2017

Since autumn 2015, the Observatoire de la Côte d'Azur and the J.L. Lagrange Laboratory have equipped the Calern Observatory with a new generation station of atmospheric turbulence measurement (CATS: Calern Atmospheric Turbulence Station).T…

CATS: a new station for a complete characterization of atmospheric turbulence Open

Tony Travouillon, Julien Chabé, F. Yan, É. Aristidi, Catherine Renaud · 2017

International audience

First results of wavefront sensing on SOTA Open

Nicolas Védrenne, Marie-Thérèse Velluet, Cyril Petit, Vincent Michau, Julien Chabé , et al. · 2015

International audience

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