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CNRS à Paris-Saclay @cnrs-paris-saclay.bsky.social · 21/08/2026

🔍🩺Letsee Imaging : la spin-off du CNRS qui révolutionne la mammographie en révélant l’invisible Leur technologie pourrait ainsi devenir la nouvelle référence mondiale du dépistage précoce. Plus d'informations ▶️ www.cnrsinnovation.com/actualite/le...

illustration mammographie © Gorodenkoff - adobe-stock

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 09/06/2026

LOA and @institutcurie.bsky.social compared laser-accelerated very-high-energy (140 MeV) electrons with conventional radiotherapy beams; demonstrating the same effects on cells, tissues, and organisms. A step toward clinical use of laser-plasma accelerators! www.sciencedirect.com/science/arti...

sciencedirect.com

Multiscale Radiobiological Assessment of Laser-Driven Very High Energy Electrons Versus Conventional Electrons

This study systematically investigates the radiobiological effects of very high energy electrons (VHEE) generated by a laser-plasma accelerator (LPA),…

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Reposted by Laboratoire d'Optique Appliqée (LOA)

Lost in Superposition @kittenstate.bsky.social · 14/02/2026

New preprint! arxiv.org/abs/2602.10882 We measure anti-bunching and witness quantum non-Gaussian states from high-harmonic generation. High-harmonics are generated in a strong field process with unique properties, distinguishing it from the established quantum light sources.

Bernie Meme: High-Harmonic. I am once again asking, are you classical or not?

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Reposted by Laboratoire d'Optique Appliqée (LOA)

Dr. Stefan Haessler @stefanhaessler.de · 24/02/2026

🚀Plasma Science Summer School!🌊 Join us on Porquerolles Island, France (June 21-27) to study: 🔹 Laser-plasma accelerators 🔹 Photon sources 🔹 Inertial fusion 🔹 Lab-Astrophysics 🎓 For PhDs & Early Career Researchers. 💰 All local costs covered! ⏳ Apply by March 27: plasmascience.fr/plasmascienc...

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 12/11/2025

Kudos to our our colleague Adrien Leblanc who is a partner in the recently awarded ERC Synergy grant NP-QED ! Together with scientists from @cea.fr ,DESY and @urochester.bsky.social, he will develop experiments that turn vacuum itself into a nonlinear medium. loa.ensta-paris.fr/2025/11/12/a...

loa.ensta-paris.fr

Adrien Leblanc partner in an ERC Synergy grant – Laboratoire d'Optique Appliquée

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 28/10/2025

Looking for an M2 internship? Most of our offers are on our website here: loa.ensta-paris.fr/join-us/ Lots of experiments on some of the planet's coolest lasers, and lots of numerical simulations!

Screenshot of the lab-website's recruitment section with a list of available M2 subjects

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 03/10/2025

La fête de la science commence à l'Ecole @polytechniqueparis.bsky.social et continue demain. Venez demain le 04/10 visiter au LOA un laboratoire où nous accelerons des électrons par laser à >99,99% de la vitesse de la lumière, et où nous développons des applications médicales. A demain ! #fds2025

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 30/09/2025

Boosting the energy and beam quality of laser-wakefield accelerated electrons with a plasma waveguide, first demonstrated at LOA in 2022 (www.nature.com/articles/s41...) has also worked at the APOLLON laser. We generated quasi-monoenergetic beams beyond 2 GeV ! loa.ensta-paris.fr/2025/09/30/q...

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 30/09/2025

Every couple of years we move the whole lab for a few days away from the daily grind in Palaiseau to some beautiful location. For the LOA Days 2025, we went to the magnificent island of Porquerolles! loa.ensta-paris.fr/2025/09/30/t...

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 10/09/2025

High-order harmonics are non-classcial! This has recently been further substantiated by @kittenstate.bsky.social and his colleagues of the QUANTUM group at LOA. loa.ensta-paris.fr/2025/09/09/q... Their observation of a displaced squeezed state is now published in @physrevresearch.bsky.social.

loa.ensta-paris.fr

Quantum Features of High-Order Harmonics – Laboratoire d'Optique Appliquée

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 05/09/2025

Antoine Cavagna is defending his PhD thesis today at LOA!

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 15/05/2025

Le LOA recrute un.e assistant.e en gestion financière et comptable, en mobilité interne du service publique (NOEMI). La date limite et déjà le 30 Mai, donc merci de faire suivre cette annonce à des personnes qui pourraient être intéressés! emploi.cnrs.fr/Offres/MOBIN...

emploi.cnrs.fr

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Dr. Stefan Haessler @stefanhaessler.de · 15/05/2025

@univparissaclay.bsky.social @ip-paris.bsky.social Join us at the FOrum de la Communauté Ultrarapide du plateau de Saclay on June 12 at Polytechnique @ecolepolytechnique.bsky.social! Register at focus.sciencesconf.org before June 1st! See you at FOCUS#4 for this great program:

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 29/04/2025

Juliette Dubois is defending her PhD thesis today!

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 29/04/2025

There's a new animal in the zoo of ultrafast pulse characterization methods: TIBETAN-FOX is a specialist of femtosecond XUV pulses, and has been demonstrated first at LOA! loa.ensta-paris.fr/2025/04/29/t...

loa.ensta-paris.fr

TIBETAN-FOX measures femtosecond XUV pulses – Laboratoire d'Optique Appliquée

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Reposted by Laboratoire d'Optique Appliqée (LOA)

Dr. Stefan Haessler @stefanhaessler.de · 04/04/2025

Are you working on scientific subjects dealing with ultrafast (or almost so) dynamics and are located on the Paris-Saclay plateau (@ip-paris.bsky.social+@univparissaclay.bsky.social)? Then join us at FOCUS on June 12th 2025 at @ecolepolytechnique.bsky.social ! focus.sciencesconf.org?lang=en

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Reposted by Laboratoire d'Optique Appliqée (LOA)

Dr. Stefan Haessler @stefanhaessler.de · 08/01/2025

Our recent paper in @opticapubsgroup.bsky.social Optics Letters presents the first relativistic plasma-mirror high harmonic generation on a liquid-sheet target. This is a real game changer for plasma mirrors ! Persistent kHz-rep.-rate with unprecedented stability. doi.org/10.1364/OL.5...

doi.org

Continuous relativistic high-harmonic generation from a kHz liquid-sheet plasma mirror

We report on continuous high-harmonic generation (HHG) at 1 kHz repetition rate from a liquid-sheet plasma mirror driven by relativistic-intensity near-single-cycle light transients. Through precise c...

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 19/12/2024

Bravo encore à notre collègue Aline Vernier, décorée cette année par la médaille de cristal du CNRS ! Voici sa vidéo portrait tournée pour l'occasion: www.youtube.com/watch?v=MlmO...

youtube.com

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 18/12/2024

We were happy to receive Prof. Donna Strickland's visit today and show her around a few of our labs. Absolutely everything at LOA runs thanks to her (and our former colleague Gerard Mourou's) Nobel-prize-decorated Chirped-pulse-amplification!

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 11/12/2024

Join the CNRS - one of the finest research institutions of the planet, and one of the possibilities to work at LOA.

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 10/12/2024

In this year's CNRS "concours" for permanent researcher positions, there's one specifically for laser-plasma particle acceleration at LOA. The application deadline is 8 Jan.; it's strongly advised to contact the lab before applying. Join us! (Cf. France's Official Journal, under N°04/02:)

legifrance.gouv.fr

Arrêté du 9 décembre 2024 autorisant au titre de l'année 2025 l'ouverture de concours sur titres et travaux pour le recrutement dans le grade des chargés de recherche de classe normale du Centre natio...

Arrêté du 9 décembre 2024 autorisant au titre de l'année 2025 l'ouverture de concours sur titres ...

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 03/12/2024

IMPALA, the method retrieving multi-spectral wavefronts from measured speckle patterns, co-developed and first demonstrated at LOA, is highlighted in the December issue of @opnmagazine.bsky.social: www.optica-opn.org/home/article...

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 29/11/2024

This wonderful Macaron has been home-baked and laser engraved with an LOA logo by one of our brilliant PhD candidates. This is the kind of rich skill set you develop during a thesis at LOA! It tastes really good, too.

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 27/11/2024

Today at LOA, Yuliia Mankovska defends her PhD thesis "High-precision probing of Laser-Plasma and electron beam-plasma interactions".

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 21/11/2024

❄️❄️❄️❄️❄️❄️❄️❄️❄️❄️❄️❄️ LOA got covered in snow today! ❄️❄️❄️❄️❄️❄️❄️❄️❄️❄️❄️❄️

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 19/11/2024

Hydrogen-gas improves the performance of a laser-plasma accelerator: we now have, at 1-kHz rep.-rate, a quasi-monoenergetic electron beam reaching up to 10 MeV, with a 15-mrad divergence and 2 pC of charge per pulse! loa.ensta-paris.fr/2024/11/19/h... Published in: doi.org/10.1103/Phys...

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 12/11/2024

LOA's QUANTUM group, with @kittenstate.bsky.social as lead author, have ou published a Phy.Rev.X Quantum-paper, proving high-harmonic-generatio to produce non-classical light states. loa.ensta-paris.fr/2024/11/12/e... doi.org/10.1103/PRXQ...

Of schematic illustration of an infrared laser pulse generating a broadband harmonic spectrum of entangled photons in a thin semiconductor

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 04/10/2024

Lors de la fête de la science à l'Ecole Polytechnique samedi 05 octobre, vous pouvez venir visiter le LOA! Vous verrez comment nous contrôlons la lumière laser pour la concentrer dans l'espace et le temps et agir avec des forces colossales sur la matière.

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 02/10/2024

This year's IP-Paris Research Day on the theme "Science Shining Light" featured 3 presentations by LOA researchers, and had old-LOA-friend and Nobel Laureate Pierre Agostini as a special guest. We enjoyed the day a lot! youtu.be/3C8H_MV5C6Q?...

youtu.be

IP Paris Research Day 2024

YouTube video by IP Paris

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 02/10/2024

LOA has created a new research group, called QUANTUM ! Check them out here: loa.ensta-paris.fr/research/ult...

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 25/09/2024

LOA has a new doctor: Dr. Silin Fu has just defended his thesis!

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 09/09/2024

Together with their collaborators of Université de Génève, LOA's F6ilm GROUP now hold a Guinness World Record: the first successful use of a laser to divert the path of a lightning strike, which took place on 24 July 2021 on the peak of Mount Säntis. www.guinnessworldrecords.com/world-record...

guinnessworldrecords.com

First laser-guided lightning

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 03/09/2024

Lucas Rovige has been awarded the 2024 PhD research award by the Plasma Physics Division of the European Physical Society (EPS) for his thesis “Optimization, stabilization and optical phase control of a high-repetition rate laser-wakefield accelerator”. Bravo! loa.ensta-paris.fr/2024/09/03/2...

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 03/09/2024

In a new paper in Appl. Phys. Lett., we show how laser-filaments can be extended by a specially designed multifocal phase mask, and guide electric discharges over 2-3 times longer distances. loa.ensta-paris.fr/2024/09/03/e... doi.org/10.1063/5.02...

Setup sketch showing the input laser beam, a focusing lens, the custom phase mask and the resulting multi-focus super-filamentation.

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 03/09/2024

We made the crucial step from merely observing the effects of the ultra-intense laser waveforms on their interaction with plasma mirrors to actually *controlling* them: "Lightwave-controlled relativistic plasma mirrors", out in Opt. Lett.: doi.org/10.1364/OL.5... loa.ensta-paris.fr/2024/09/03/l...

HHG sepctrograms and electron beamprofiles for two different driving laser waveforms

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Dr. Stefan Haessler @stefanhaessler.de · 11/06/2024

Finally, the pre-print about our now >3-year old results on CEP-control of relativistic plasma mirrors is on arXiv. This has been a real milestone: it's the important step from observation to *control* of the attosecond collective electron dynamics. arxiv.org/abs/2406.06396

arxiv.org

Lightwave-controlled relativistic plasma mirrors

We report on attosecond-scale control of high-harmonic and electron emission from plasma mirrors driven by relativistic-intensity near-single-cycle lightwaves at kHz repetition rate. By...

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 04/03/2024

Pablo San-Miguel-Claveria receives the René Pellat thesis prize of the French Physical Society's (SFP) plasma division. Congratulations Pablo!

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Dr. Stefan Haessler @stefanhaessler.de · 05/12/2023

Together with my friends and colleagues of LIDYL at CEA Saclay, I wrote a little history of the discoveries of this year's Nobel Prize in Physics for attosecond pulses. It's out now in the journal Photoniques: doi.org/10.1051/phot...

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Reposted by Laboratoire d'Optique Appliqée (LOA)

Dr. Stefan Haessler @stefanhaessler.de · 04/12/2023

We've written up all technical detail about our relativistic laser-plasma interaction setup at LOA, with simultaneous XUV light, electron and ion detectors. It is finannly out in Rev.Sci.Instr. : doi.org/10.1063/5.01...

doi.org

High repetition rate relativistic laser–solid–plasma interaction platform featuring simultaneous...

We report on a uniquely designed high repetition rate relativistic laser–solid–plasma interaction platform, featuring the first simultaneous measurement of emit

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Laboratoire d'Optique Appliqée (LOA) @labooptappl.bsky.social · 04/03/2024

Photoshoot with the PCO group in Salle Noire 2.0

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