Anne LOUCHET-CHAUVET

Anne LOUCHET-CHAUVET Chargée de recherche au CNRS Tél. : 01 80 96 30 42 Pièce : R24 Courriel :

Thèmes de recherche

• Retournement temporel analogique de signaux RF
• Filtrage pour l’imagerie acousto-optique en milieu diffusant
• Conception et développement d’architectures de traitement du signal
• Optomécanique dans les cristaux dopés terre rare

Propositions de stage ou de thèse

PhD proposal 2024 Inertial sensing

Post-doc proposal 2024 - Inertial sensing

Cliquez sur les images ci-contre pour découvrir les offres de stage, thèse et post-doc dans l’équipe.


N’hésitez pas à nous contacter !

Actualités

• avril 2025 : notre travail sur le retournement temporel analogique préservant la phase est disponible sur arXiv. Bravo Thomas pour ces beaux résultats !
• janvier 2025 : Thomas Llauze a soutenu sa thèse de doctorat, intitulée "Développement d’une architecture analogique symétrique pour le retournement temporel de signaux RF large bande à l’aide de cristaux dopés aux ions de terre rare". Bravo Thomas !
• novembre 2024 : bienvenue à Flora Segur qui commence une thèse CIFRE sur l’analyse spectrale, dans le cadre de notre collaboration avec Thales Research&Technology !
• octobre 2024 : bienvenue à Lucas Duclos qui commence une thèse sur l’imagerie acousto-optique à BIOMAPS, dans le cadre d’une collaboration avec Claude Comtat et Jean-Luc Gennisson.
• septembre 2024 : notre projet GOMMETTE (Guides d’Ondes Monocristallins pour les capteurs et Mémoires quantiquEs compaTibles TÉlécom), coordonné par Alban Ferrier (IRCP) et en collaboration avec Perrine Berger, Sacha Welinski (TRT), Anne Talneau (C2N) a été sélectionné par le comité ASTRID !
• juillet 2024 : notre projet CHORIZO (Quantum Hybrid Optomechanics with Rare-earth Ion-dOped MaterialZ) a été sélectionné par l’ANR !
• mai 2024 : bienvenue à Paul Lafages qui commence un stage de M1 dans l’équipe sur la mesure de vibrations !
• mars 2024 : nos travaux sur la génération de balayages en fréquence rapides et précis sont publiés dans Applied Optics (et consultables sur arxiv). Bravo à Thomas et Félix pour ce gros travail !
• janvier 2024 : notre article de vulgarisation sur l’imagerie acousto-optique est publié dans Techniques de l’Ingénieur !
• novembre 2023 : nos travaux sur l’action en retour optomécanique dans un cristal dopé aux ions de terre rare, sont publiés dans Physical Review Applied ! Le papier est mis à l’honneur comme "Editor’s suggestion".
• janvier 2023 : Notre théorie sur l’interaction ion-ion véhiculée par la contrainte dans les solides dopés est publiée dans Journal of Physics : Condensed Matter !
• décembre 2022 : publication de nos travaux sur les premières images acousto-optiques in-vivo dans Biomedical Optics Express, un article mis à l’honneur comme "Editor’s pick" ! Bravo Quang et Ghadir !
• décembre 2022 : Lothaire Ulrich a soutenu sa thèse de doctorat à Thales TRT, intitulée "Spectro-spatial architectures in rare-earth ion-doped crystals for wideband radiofrequency signal processing". Bravo Lothaire !
• juillet 2022 : publication de nos travaux sur la réalisation d’un filtre agile haute performance pour les signaux RF dans un cristal dopé dans IEEE Journal of Lightwave Photonics.
• avril 2022 : publication de nos mesures de vibrations ultra-sensibles en milieu cryogénique dans le numéro spécial "Quantum Acoustics" de AVS Quantum Science.
• octobre 2021 : arrivée de Thomas Llauze pour une thèse de 3 ans sur le retournement temporel analogique de signaux RF.
• juillet 2021 : arrivée de Quang-Minh Thai pour un post-doc sur l’imagerie acousto-optique in-vivo.
• mai 2021 : arrivée de Félix Montjovet pour un stage sur le contrôle des chirps d’un laser DBR.
• mai 2020 : publication de notre démonstration d’analyse spectrale large bande de signaux radio-fréquence sur porteuse optique à longueur d’onde télécom
• février 2020 : publication de nos travaux sur la mise au point d’un matériau amélioré pour le traitement de signaux optiques, une collaboration avec l’IRCP et Thales Research&Technology.
• décembre 2019 : arrivée de Lothaire Ulrich pour une thèse CIFRE de 3 ans sur le filtrage et l’analyse spectrale de signaux RF, à Thales R&T.
• novembre 2019 : l’équipe s’installe à l’Institut Langevin.
• juillet 2019 : notre projet sur le retournement temporel de signaux RF est financé par l’ANR ! Voir le site dédié ici
• mai 2019 : dépôt du brevet "Matériau amélioré pour le traitement spectro-spatial de signaux optiques", en collaboration avec l’IRCP et Thales RT.

Collaborations

• François Ramaz et Maïmouna Bocoum (Institut Langevin) : imagerie acousto-optique en milieu diffusant
• Thierry Chanelière, Signe Seidelin, Jean-Philippe Poizat (Institut Néel) : architectures de traitement de signal classiques et quantiques, décohérence et couplage optomécanique dans les cristaux dopés
• Alban Ferrier, Alexey Tiranov, Philippe Goldner (Chimie ParisTech) : croissance et spectroscopie de matériaux dopés
• Loïc Morvan, Perrine Berger, Sacha Welinski (Thales Research & Technology) : architectures de traitement de signaux radar
• Pierre Verlot (LuMIn) : optomécanique hybride
• Claude Comtat, Jean-Luc Gennisson (BIOMAPS) : imagerie médicale

Publications à l’Institut Langevin

Analog phase-sensitive time-reversal of optically carried radiofrequency signals Llauze, T., and A. Louchet-Chauvet Optics Letters 50, no. 16, 4874-4877 (2025) Résumé: Achieving low-latency time-reversal of broadband radiofrequency signals is crucial for reliable communications in dynamic, uncontrolled environments. However, existing approaches are either digitally assisted—making broadband extension challenging—or limited to amplitude modulation. In this work, we report the very first, to our knowledge, experimental realization of a fully analog, phase-preserving time-reversal architecture for optically carried radiofrequency signals. The method exploits the exceptional coherence properties of rare-earth ion-doped materials and leverages the well-established photon echo mechanism, widely used in quantum technologies. While our demonstration is conducted with a modest bandwidth, we identify the fundamental cause of this limitation and propose solutions for future scalability.
Versatile, fast, and accurate frequency excursions with a semiconductor laser Llauze, T., F. Montjovet-Basset, and A. Louchet-Chauvet Applied Optics 63, no. 19, 5192-5202 (2024) Résumé: Achieving accurate arbitrary frequency excursions with a laser can be quite a technical challenge, especially when steep slopes (GHz/μs) are required, due to both deterministic and stochastic frequency fluctuations. In this work we present a multistage correction combining four techniques: pre-distorsion of the laser modulation, iterative correction, opto-electronic feedback loop, and feed-forward correction. This combination allows us not only to compensate for the non-instantaneous response of the laser to an input modulation but also to correct in real time the stochastic frequency fluctuations.We implement this multistage architecture on a commercial DBR laser and verify its efficiency, first, with monochromatic operation, and second, with highly demanding frequency excursions. We demonstrate that our multistage correction not only enables a strong reduction of the laser linewidth but also allows steep frequency excursions with a relativeRMSfrequency errorwell below1%and a laser spectral purity consistently better than 100 kHz, even in the midst of gigahertz-scale frequency excursions.
Piezo-orbital backaction force in a rare-earth-doped crystal Louchet-Chauvet, A., P. Verlot, J. P. Poizat, and T. Chanelière Physical Review Applied 20, no. 5 (2023) Résumé: We investigate a system composed of an ensemble of room-temperature rare-earth ions embedded in a bulk crystal, intrinsically coupled to internal strain via their sensitivity to the surrounding crystal field. We evidence the generation of a mechanical response under resonant atomic excitation. We find this motion to be the sum of two fundamental, resonant optomechanical backaction processes: a conservative, piezo-orbital mechanism, resulting from the modification of the crystal field associated with the promotion of the ions to their excited state, and a dissipative, nonradiative photothermal process related to the phonons generated throughout the atomic population relaxation. Our work expands the horizons of research in hybrid optomechanics, and unveils unexplored interactions that may be key for understanding the dephasing dynamics of ultracoherent rare-earth ions.
Strain-mediated ion-ion interaction in rare-earth-doped solids Louchet-Chauvet, A., and T. Chanelière Journal of Physics Condensed Matter 35, no. 30, 305501 (2023) Résumé: It was recently shown that the optical excitation of rare-earth ions produces a local change of the host matrix shape, attributed to a change of the rare-earth ion's electronic orbital geometry. In this work we investigate the consequences of this piezo-orbital backaction and show from a macroscopic model how it yields a disregarded ion-ion interaction mediated by mechanical strain. This interaction scales as 1/r3, similarly to the other archetypal ion-ion interactions, namely electric and magnetic dipole-dipole interactions. We quantitatively assess and compare the magnitude of these three interactions from the angle of the instantaneous spectral diffusion mechanism, and re-examine the scientific literature in a range of rare-earth doped systems in the light of this generally underestimated contribution.
In vivo ultrasound modulated optical tomography with a persistent spectral hole burning filter Thai, Q. M., G. Kalot, C. Venet, J. Seguin, M. Bocoum, N. Mignet, F. Ramaz, and A. Louchet-Chauvet Biomedical Optics Express 13, no. 12, 6484-6496 (2022) Résumé: We present in vivo ultrasound modulated optical tomography (UOT) results on mice, using the persistent spectral hole burning (PSHB) effect in a Tm3+:YAG crystal. Indocyanine green (ICG) solution was injected as an optical absorber and was clearly identified on the PSHB-UOT images, both in the muscle (following an intramuscular injection) and in the liver (following an intravenous injection). This demonstration also validates an experimental setup with an improved level of performance combined with an increased technological maturity compared to previous demonstrations.
High rejection and frequency agile optical filtering of RF signals using a rare earth ion-doped crystal Ulrich, L., S. Welinski, A. Louchet-Chauvet, J. D. Rosny, D. Dolfi, C. Vaneph, P. Berger, and L. Morvan Journal of Lightwave Technology 40, no. 20, 6901-6910 (2022) Résumé: While photonics is broadly considered as a leading solution for analog RF processing, photonic RF filters often show a limited out-of-band rejection. In this work we demonstrate a high rejection and high steepness photonic RF bandpass filter based on spectral hole burning in a rare earth ion-doped crystal. The filter is obtained by programming a frequency-selective absorption grating in the crystal. With an experimental and theoretical study we identify the optimal parameters for this filter. We achieve a remarkable rejection of 60 dB and a rejection of 45 dB at 50 MHz from the edge of the filter, compliant with most demanding applications.
Limits to the sensitivity of a rare-earth-enabled cryogenic vibration sensor Louchet-Chauvet, A., and T. Chanelière AVS Quantum Science 4, no. 2, 024401 (2022) Résumé: Cryogenics is a pivotal aspect in the development of quantum technologies. Closed-cycle devices have recently emerged as an environmentally friendly and low-maintenance alternative to liquid helium cryostats. Yet the larger level of vibrations in dry cryocoolers forbids their use in most sensitive applications. In a recent work, we have proposed an inertial, broadband, contactless sensor based on the piezospectroscopic effect, i.e., the natural sensitivity of optical lines to strain exhibited by impurities in solids. This sensor builds on the exceptional spectroscopic properties of rare earth ions and operates below 4 K, where spectral hole burning considerably enhances the sensitivity. In this paper, we investigate the fundamental and technical limitations of this vibration sensor by comparing a rigid sample attachment to the cold stage of a pulse-tube cryocooler and a custom-designed exchange gas chamber for acoustic isolation.
Telecom wavelength optical processor for wideband spectral analysis of radiofrequency signals Louchet-Chauvet, A., P. Berger, P. Nouchi, D. Dolfi, A. Ferrier, P. Goldner, and L. Morvan Laser Physics 30, no. 6 (2020) Résumé: © 2020 Astro Ltd. In this paper we present a spectral analyzer for wideband RF signals with a spectral hole-burning-based architecture operating at telecom wavelength. This device is based on a codoped Er3 +:Sc3 +:Y2SiO5 crystal whose inhomogeneous linewidth allows for wideband operation. With time-resolved holeburning spectroscopy experiments we study the homogeneous linewidth and spectral diffusion in an unusual magnetic field configuration. We finally demonstrate the spectral analysis of RF signals with 28 GHz instantaneous bandwidth and MHz resolution. This work opens the way towards more complex architectures such as direction finding with wideband capacity. Mots-clés: rare-earth doped crystals; spectral analysis; spectral holeburning
Tailoring the 3F4 level lifetime in Tm3+: Y3Al5O12 by Eu3+ co-doping for signal processing application Zhang, Z., A. Louchet-Chauvet, L. Morvan, P. Berger, P. Goldner, and A. Ferrier Journal of Luminescence 222 (2020) Résumé: © 2020 Elsevier B.V. Tm3+: Y3Al5O12 (Tm:YAG) crystal is a promising material for high-resolution spectral analysis of broadband radio-frequency (RF) signals, where the absorption spectrum is modified via spectral hole burning. In Tm:YAG, the efficiency of the spectral tailoring is limited by the long-lived metastable level 3F4, acting as a bottleneck for the optical pumping mechanism. We demonstrate that co-doping Tm:YAG with Eu3+ ions can significantly shorten the optical lifetime of 3F4 state, while that of 3H4 is essentially conserved. We show with a model that these modified lifetimes allow faster tailoring of the absorption profile. Because of their low cost and easiness of processing, we use Tm3+ and Eu3+ co-doped Y3Al5O12 ceramics to probe the energy transfer efficiency and find the optimal cation co-doping concentration. Furthermore, we show that Eu3+ co-doping increases the inhomogeneous broadening on the Tm3+ optical transition, hence the spectral analysis bandwidth. Finally, we confirm these results on a single crystal grown by the Czochralski method. Mots-clés: Crystal growth; Rare earth spectroscopy; RF signal processing; Tm,Eu:YAG crystal
Structured ultrasound-modulated optical tomography Bocoum, M., J. L. Gennisson, J. B. Laudereau, A. Louchet-Chauvet, J. M. Tualle, and F. Ramaz Applied Optics 58, no. 8, 1933-1940 (2019) Résumé: © 2019 Optical Society of America Ultrasound-modulated optical tomography (UOT) is an imaging technique that couples light and ultrasound in order to perform in-depth imaging of highly scattering media. In previous work, we introduced plane wave UOT, an imaging method analogous to x-ray tomography based on the filtered backprojection for image reconstruction. Angle-limited measurements, however, led to drastic loss of lateral spatial resolution. Here, we present a new structured ultrasonic plane wave UOT method that allows partial recovery of the resolution. For image reconstruction, we present a generalization of the Fourier slice theorem along with a generalized filtered backprojection formalism. The method is successfully tested on simulated and experimental data.
Deep and persistent spectral holes in thulium-doped yttrium orthosilicate for imaging applications Venet, C., B. Car, L. Veissier, F. Ramaz, and A. Louchet-Chauvet Physical Review B 99, no. 11 (2019) Résumé: © 2019 American Physical Society. With their optical wavelength in the near infrared (790-800 nm) and their unique spectroscopic properties at cryogenic temperatures, thulium-doped crystals are at the center of many architectures linked to classical signal processing and quantum information. In this work, we focus on Tm-doped YSO, a compound that was left aside in the mid-1990s due to its rather short optical coherence lifetime. By means of time-resolved hole-burning spectroscopy, we investigate the anisotropic enhanced nuclear Zeeman effect and demonstrate deep, sub-MHz, persistent spectral hole burning under specific magnetic field orientation, and magnitude. By estimating the experimental parameters corresponding to a real-scale ultrasound optical tomography setup using Tm:YSO as a spectral filter, we validate Tm:YSO as a promising compound for medical imaging in the human body.
Ultrasound-modulated optical tomography in scattering media: Flux filtering based on persistent spectral hole burning in the optical diagnosis window Venet, C., M. Bocoum, J. B. Laudereau, T. Chaneliere, F. Ramaz, and A. Louchet-Chauvet Optics Letters 43, no. 16, 3993-3996 (2018) Résumé: © 2018 Optical Society of America. Ultrasound-modulated optical tomography (UOT) is a powerful imaging technique to discriminate healthy from unhealthy biological tissues based on their optical signature. Among the numerous detection techniques developed for acousto-optic imaging, only those based on spectral filtering are intrinsically immune to speckle decorrelation. This Letter reports on UOT imaging based on spectral hole burning in Tm:YAG crystal under a moderate magnetic field (200G) with a well-defined orientation. The deep and long-lasting holes translate into a more efficient UOT imaging with a higher contrast and faster imaging frame rate. We demonstrate the potential of this method by imaging calibrated phantom scattering gels.
High resolution, large dynamic range spectral filtering at 800 nm using Tm:YAG crystals Louchet-Chauvet, A., R. Lauro, P. Goldner, F. Ramaz, T. Chanelière, and J.-L. Le Gouët Proceedings of SPIE - The International Society for Optical Engineering 7948 (2011) Résumé: Thulium-doped crystals are considered for programmable filtering. Such a filter can be acllieved by Spectral Hole Burning (SHB). One optically pumps the active ions into a long-lived shelving state, opening a narrow transparency window in the crystal absorption band. We investigate a new shelving scheme in Tm:YAG where the thulium ions are pumped into a ground state nuclear Zeeman sublevel, instead of their natural 10ms-lifetime metastable state. The shelving time is increased to several seconds, reducing the residual population in the transparency window by orders of magnitude. This should enhance the filter's dynamic range, which is essential in demanding filtering applications like ultrasound optical tomography. © 2011 SPIE. Mots-clés: High-resolution spectral filtering; Rare-earth ion-doped crystals; Spectral hole-burning; Ultrasound-modulated optical tomography; Active ions; Crystal absorption; Doped crystals; Dynamic range; Filtering applications; High resolution; Meta-stable state; Orders of magnitude; Rare earth ions; Spectral filtering; Spectral hole-burning; Thulium ions; Ultrasound-modulated optical tomography; YAG; YAG crystal; Crystals; Erbium doped fiber amplifiers; Ions; Optical tomography; Quantum computers; Quant

Publications antérieures

Optical study of the anisotropic erbium spin flip-flop dynamics B. Car, L. Veissier, A. Louchet-Chauvet, J.-L. Le Gouët, T. Chanelière Phys. Rev. B 100, 165107 (2019)
Piezospectroscopic measurement of high-frequency vibrations in a pulse-tube cryostat A. Louchet-Chauvet, R. Ahlefeldt, T. Chanelière Review of Scientific Instruments 90, 034901 (2019)
Two-pulse photon echo area theorem in an optically dense medium R. Urmancheev, K. Gerasimov, M. Minnegaliev, T. Chanelière, A. Louchet-Chauvet, S. Moiseev Optics Express 27, 28983 (2019)
Analog time-reversal of optically-carried RF signals with a rare earth ion-doped processor with broadband potential A. Louchet-Chauvet 2018 International Topical Meeting on Microwave Photonics (2018)
Rate equation reformulation including coherent excitation: application to periodic protocols based on spectral holeburning Y. Attal, P. Berger, L. Morvan, P. Nouchi, D. Dolfi, T. Chanelière, A. Louchet-Chauvet J. Opt. Soc. Am. B 35, 1260 (2018)
Selective optical addressing of nuclear spins through superhyperfine interaction in rare-earth doped solids B. Car, L. Veissier, A. Louchet-Chauvet, J.-L. Le Gouët, T. Chanelière Phys. Rev. Lett. 120, 197401 (2018)
Effects of disorder on optical and electron spin linewidths in Er3+,Sc3+:Y2SiO5 S. Welinski, C. W. Thiel, J. Dajczgewand, A. Ferrier, R. L. Cone, R. M. Macfarlane, T. Chanelière, A. Louchet-Chauvet, Ph. Goldner Optical Materials 63, 69 (2017)
Quantum memory in an orthogonal geometry of silenced echo retrieval K.I. Gerasimov, M.M. Minnegaliev, S.A. Moiseev, R.V. Urmancheev, T. Chanelière, A. Louchet-Chauvet Optics and Spectroscopy 123, no. 2, 211 (2017)
Scandium doped Tm:YAG ceramics and single crystals : coherent and high resolution spectroscopy A. Ferrier, S. Ilas, P. Goldner, A. Louchet-Chauvet Journal of Luminescence 194, 116 (2017)
RF spectrum analyzer for pulsed signals: ultra-wide instantaneous bandwidth, high sensitivity and high time-resolution P Berger, Y Attal, M Schwarz, S Molin, A Louchet-Chauvet, T Chanelière, J-L Le Gouët, D Dolfi, L Morvan Journal of Lightwave Technology 34, 4658 (2016)
Interlaced spin grating for optical wave filtering H. Linget, T. Chanelière, J.-L. Le Gouët, P. Berger, L. Morvan, A. Louchet-Chauvet Physical Review A 91, 023804 (2015)
Optical measurement of heteronuclear cross-relaxation interactions in Tm:YAG R. L. Ahlefeldt, M. F. Pascual-Winter, A. Louchet-Chauvet, T. Chanelière, J.-L Le Gouët Physical Review B 92, 094305 (2015)
Optical memory bandwidth and multiplexing capacity in the erbium telecommunication window J. Dajczgewand, R. Ahlefeldt, T. Böttger, A. Louchet-Chauvet, J.-L.Le Gouet, T. Chanelière New Journal of Physics 17, 023031 (2015)
Cristaux et dispositifs optiques pour le traitement de l'information quantique T. Chanelière, A. Louchet-Chauvet, A. Ferrier, P. Goldner, Techniques de l'Ingénieur, e6367 (2014)
Détermination de l'accélération de la pesanteur pour la balance du watt du LNE S Merlet, P Gillot, T Farah, Q Bodart, J Le Gouët, P Cheinet, C Guerlin, A Louchet-Chauvet, N Malossi, A Kopaev, O Francis, G D'Agostino, M Diament, G Geneves, A Clairon, A Landragin, F Pereira Dos Santos Revue Française de Métrologie 36, 11-27 (2014)
Large efficiency at telecom wavelength for optical quantum memories J. Dajczgewand, J.-L. Le Gouët, A. Louchet-Chauvet, T. Chanelière Optics Letters 39, 2711 (2014)
Photon echo with a few photons in two-level atoms M. Bonarota, J. Dajczgewand, A. Louchet-Chauvet, J.-L. Le Gouët, T. Chanelière Laser Physics 24, 094003 (2014)
Time reversal of light by linear dispersive filtering near atomic resonance H. Linget, T. Chanelière, J-L Le Gouët and A Louchet-Chauvet New J. Phys. 15, 063037 (2014)
Time-reversal of optically-carried radiofrequency signals in the microsecond range H. Linget, L. Morvan, J.-L. Le Gouët and A. Louchet-Chauvet Optics Letters 38, 643 (2013)
Adiabatic passage with spin locking in Tm3+:YAG M. F. Pascual-Winter, R.-C. Tongning, R. Lauro, A. Louchet-Chauvet, T. Chanelière, J.-L. Le Gouët Phys. Rev. B 86, 064301 (2012)
Revival of silenced echo and quantum memory for light V. Damon, M. Bonarota, A. Louchet-Chauvet, T. Chanelière, J.-L. Le Gouët New J. Phys. 13, 093031 (2011)