Explanipedia

Surfer 2: The Next Generation of Cross-Platform Computer Use Agents Open

Mathieu Andreux, Yanael Barbier, Hamza Benchekroun, Emilien Biré, Antoine Bonnet , et al. · 2025

Building agents that generalize across web, desktop, and mobile environments remains an open challenge, as prior systems rely on environment-specific interfaces that limit cross-platform deployment. We introduce Surfer 2, a unified archite…

Coupling light field imaging and imaging modeling in a backlight configuration to measure size, shape and 3D location of bubbles and droplets Open

Jean‐Bernard Blaisot, Marc Brunel, Valentin Muset · 2025

International audience

Surfer-H Meets Holo1: Cost-Efficient Web Agent Powered by Open Weights Open

Mathieu Andreux, Breno Baldas Skuk, Hamza Benchekroun, Emilien Biré, Antoine Bonnet , et al. · 2025

We present Surfer-H, a cost-efficient web agent that integrates Vision-Language Models (VLM) to perform user-defined tasks on the web. We pair it with Holo1, a new open-weight collection of VLMs specialized in web navigation and informatio…

Modeling dispersive and active ring resonators with discrete optical components: from injected loops to mode-locked lasers Open

Nicolas Barré, Marc Brunel · 2025

This article introduces a general framework for modeling the dynamics of active ring resonators with both continuous and discrete optical elements under the traveling-wave approximation. The framework is built upon a rigorous derivation of…

Differentiable wave propagation method for shape optimization of freeform optics beyond the paraxial approximation Open

Nicolas Barré, Marc Brunel · 2025

Freeform optics provides precise control of light for beam shaping and mode conversion, but designing volumetric micro-optical elements requires efficient, low-runtime simulation methods. The wave propagation method (WPM) offers a fast alt…

Modeling dispersive and active ring resonators with discrete optical components: from injected loops to mode-locked lasers Open

Nicolas Barré, Marc Brunel · 2025

This article introduces a general framework for modeling the dynamics of active ring resonators with both continuous and discrete optical elements, under the traveling-wave approximation. The framework is built upon a rigorous derivation o…

Slow and fast light effects induced by interference with a control light field Open

Hughes Guillet de Chatellus, Goulc’Hen Loas, Louis Alliot, Marc Brunel · 2024

The group velocity of light is governed by the dispersive properties of the optical material. Controlling these properties has led to concepts such as fast and slow light. In a vacuum, the group velocity of light is equal to c, excluding a…

Lasers ytterbium bipolarisations : rôle de la direction de polarisation de l’onde pompe Open

Gaedze Kudjo Herman Akagla, Pavel Loiko, Goulc’Hen Loas, Abdelmjid Benayad, Patrice Camy , et al. · 2024

ÉMISSION DE DEUX PEIGNES DE FRÉQUENCES, SYNCHRONES OU ASYNCHRONES, PAR UN LASER YB:YAG Open

Gaedze Kudjo Herman Akagla, Goulc’Hen Loas, Marc Vallet, Marc Brunel · 2024

Particle Shape Recognition with Interferometric Particle Imaging Using a Convolutional Neural Network in Polar Coordinates Open

Alexis Abad, Alexandre Fahy, Quentin Frodello, Barbara Delestre, Mohamed Talbi , et al. · 2023

A convolutional neural network (CNN) was used to identify the morphology of rough particles from their interferometric images. The tested particles had the shapes of sticks, crosses, and dendrites as well as Y-like, L-like, and T-like shap…

Pump-Polarization Dependence of the Bipolarization Emission in Ytterbium Lasers Open

Gaedze Kudjo Herman Akagla, Nicolas Chapron, Pauline Lehoux, Goulc’Hen Loas, Pavel Loiko , et al. · 2023

International audience

Phase-Locked Dual Polarization Frequency Combs in Yb:YAG Open

Gaedze Kudjo Herman Akagla, Goulc’Hen Loas, Marc Vallet, Marc Brunel · 2023

International audience

Control of the bipolarization emission of an Yb:YAG laser by the orientation of the pump polarization Open

Gaedze Kudjo Herman Akagla, Nicolas Chapron, Goulc’Hen Loas, Marc Vallet, Marc Brunel · 2023

We show that the polarized pumping can be used to control the relative powers of two linear, orthogonally polarized, eigenstates in a Yb:YAG laser. The experimental observations are in full agreement with a two-mode rate-equation model, hi…

Nonlinear frequency chirps from a stabilized injected phase-modulated fiber laser loop Open

Marc Brunel, Ludovic Frein, Goulc’Hen Loas, Anthony Carré, Thomas Le Beux , et al. · 2023

A phase-modulated frequency-shifting loop is injected by a single-frequency laser at 1.5 μm. In so-called Talbot conditions, i.e., when the modulation frequency is an integer multiple of the inverse of the cavity round-trip time, the loop …

3D-Tracking of Sand Particles in a Wave Flume Using Interferometric Imaging Open

Marc Brunel, Lila Ouldarbi, Alexandre Fahy, Gaële Perret · 2022

We report the 3D-tracking of irregular sand particles in a wave flume using a cylindrical interferometric particle imaging set-up. The longitudinal position of each particle is deduced from the ellipticity of its speckle-like interferometr…

CONTRÔLE DE L' ÉMISSION BIPOLARISATION D'UN LASER YB:YAG PAR L'ORIENTATION DE LA POLARISATION DE LA POMPE Open

Gaedze Kudjo Herman Akagla, Nicolas Chapron, Goulc’Hen Loas, Marc Vallet, Marc Brunel · 2022

International audience

Beyond Fresnel’s approximation: Luneburg’s kernel to simulate the interferometric images of droplets or irregular rough particles Open

Marc Brunel, Emmanuel Porcheron, Pascal Lemaitre, Jeroen van Beeck, Maria Rosaria Vetrano , et al. · 2022

3D tomographic reconstruction of irregular rough particles from interferometric images Open

Barbara Delestre, Alexis Abad, Mohamed Talbi, Michaël Fromager, Marc Brunel · 2022

Interferometric Ice Particle Imaging in a Wind Tunnel Open

Mohamed Talbi, Romain Duperrier, Barbara Delestre, Gilles Godard, Marc Brunel · 2021

We report interferometric ice particle imaging and sizing in an icing wind tunnel with wind speeds of 70 m/s. Single particle interferograms are first analysed, size measurements are performed, and examples of possible reconstructed shapes…

Assessment about Luneberg integrals and application to digital in-line holography Open

Sébastien Coëtmellec, Denis Lebrun, Marc Brunel, A. J. E. M. Janssen · 2021

In this publication, the Luneberg integrals are revisited and the conditions of the using of such integrals have been recalled. Additivity law of Luneberg’s integrals and the link with the Frenel kernel for the propagation are discussed. B…

Experimental particle’s shapes reconstructions from their interferometric images using the Error-Reduction algorithm Open

Barbara Delestre, Alexis Abad, Mohamed Talbi, Michaël Fromager, Marc Brunel · 2021

Optical frequency-to-time mapping using a phase-modulated frequency-shifting loop Open

Hongzhi Yang, Marc Brunel, Marc Vallet, Haiyang Zhang, Changming Zhao · 2021

A real-time spectral analysis is demonstrated experimentally with a frequency-shifting loop that includes an electro-optic phase modulator. When a single-frequency laser seeds the loop, pulse doublets are emitted if the integer Talbot cond…

Assessment About Luneberg Integrals and Application to Digital in-line Holography Open

Sébastien Coëtmellec, Denis Lebrun, Marc Brunel, A. J. E. M. Janssen · 2020

In this publication, the Luneberg integrals are revisited and the conditions of the using of such integrals have been recalled. Additivity law of Luneberg's integrals and the link with the Frenel kernel for the propagation are discussed. B…

Analysis of frequency-shifting loops in integer and fractional Talbot conditions: electro-optic versus acousto-optic modulation Open

Hongzhi Yang, Marc Brunel, Marc Vallet, Haiyang Zhang, Changming Zhao · 2020

Frequency-shifting loops (FSLs) are analyzed theoretically in cases where the intracavity modulator induces two sidebands at each round trip, a situation that can be commonly obtained with electro-optic intensity or phase modulators. Using…

Interferometric imaging for the tomography of rough particles in a flow: A case study Open

Marc Brunel, Barbara Delestre, Mohamed Talbi, Michaël Fromager · 2020

Delay-induced instability in phase-locked dual-polarization distributed-feedback fiber lasers Open

Marie Guionie, Marco Romanelli, Aurélien Thorette, Anthony Carré, Emmanuel Pinsard , et al. · 2020

We study experimentally and theoretically a dual-polarization fiber laser submitted to time-delayed frequency-shifted optical feedback. In addition to the usual frequency-locking regime that is expected when the frequency shift is close to…

Third glare point effect in 90°Interferometric Laser Imaging for Droplet Sizing Open

Justin Jacquot, Mohamed Talbi, Marc Brunel · 2020

Phase-locking and delay-induced instabilities in a dual- frequency fiber laser Open

Marie Guionie, Aurélien Thorette, Marco Romanelli, Anthony Carré, Goulc’Hen Loas , et al. · 2019

International audience

Microwave-Optical Fiber Lasers Stabilized by Frequency-Shifted Feedback Open

Marie Guionie, Marc Vallet, Marc Brunel, Aurélien Thorette, Marco Romanelli , et al. · 2019

Dual-frequency fiber lasers (DFFL) are shown to provide high purity beat notes for microwave signal generation and distribution. We study the stabilization of the beat from DFB DFFLs by using optical frequency-shifted feedback loop contain…

Oscillateur opto-électronique hybride à laser fibre bifréquence Open

Marie Guionie, Aurélien Thorette, Marco Romanelli, Anthony Carré, Goulc’Hen Loas , et al. · 2019

Dans le contexte de la photonique microonde, nous demontrons la stabilisation du battement d'un laser a fibre DFB bifrequence a 1,5 µm. Un oscillateur opto-electronique (OEO) auto-reference a 1 GHz est realise au moyen d'une boucle de rein…

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