A5058842772- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Advanced MRI Techniques and Applications
- Mechanical and Optical Resonators
- Advanced Fiber Laser Technologies
- Spectroscopy and Laser Applications
- Quantum, superfluid, helium dynamics
- Analytical Chemistry and Sensors
- Acoustic Wave Resonator Technologies
- nanoparticles nucleation surface interactions
- Photonic and Optical Devices
- Magnetic Properties and Applications
- Magnetic Field Sensors Techniques
- Combustion and Detonation Processes
- Nanowire Synthesis and Applications
- Solid-state spectroscopy and crystallography
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Magnetic properties of thin films
- Heat Transfer and Boiling Studies
- Fusion materials and technologies
- Chemical Thermodynamics and Molecular Structure
- Optical Systems and Laser Technology
Centre National de la Recherche Scientifique
2014-2024
Chimie ParisTech
2024
Université Polytechnique Hauts-de-France
2022-2024
École Centrale de Lille
2022-2024
Institut d'électronique de microélectronique et de nanotechnologie
2021-2024
Université de Lille
2022-2024
Institut de Recherche de Chimie Paris
2024
National Institute of Standards and Technology
2018-2021
École Nationale Supérieure de Mécanique et des Microtechniques
2014-2020
Franche-Comté Électronique Mécanique Thermique et Optique - Sciences et Technologies
2014-2020
Laboratory optical atomic clocks achieve remarkable accuracy (now counted to 18 digits or more), opening possibilities for exploring fundamental physics and enabling new measurements.However, their size the use of bulk components prevent them from being more widely adopted in applications that require precision timing.By leveraging silicon-chip photonics integration reduce component complexity, we demonstrate a compact optical-clock architecture.Here semiconductor laser is stabilized an...
Optical frequency standards, or lasers stabilized to atomic molecular transitions, are widely used in length metrology and laser ranging, provide a backbone for optical communications lie at the heart of next-generation clocks. Here we demonstrate compact, low-power reference based on Doppler-free, two-photon transition rubidium-87 778 nm implemented micro-optics breadboard. Our achieves fractional instability 2.9×10 −12 / <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
MEG based on optically-pumped magnetometry (OP-MEG) operates with miniaturized, wearable insulation, in contrast to massive cryogenic dewars for SQUID-MEG, and allows placement of the sensors close scalp. This more natural head motion during data recording localized signal quality comparable to, or surpassing, SQUID-MEG. However no OP-MEG system date has offered full-head coverage dense sensor packing, existing systems - as SQUID-MEG require subject be sealed a multilayer, passively-shielded...
Microfabricated alkali vapor cells are key to enable miniature devices such as atomic clocks and optically pumped magnetometers with reduced size, weight power. Yet, more versatile fabrication methods still needed further expand their use cases. Here, we demonstrate a novel approach collectively fill seal microfabricated cesium using locally-sealed microchannels patterned within one of the glass substrates comprising cells. Unlike current that rely on wafer-level anodic bonding last sealing...
Abstract This paper reports on an original architecture of microfabricated alkali vapor cell designed for miniature atomic clocks. The combines diffraction gratings with anisotropically etched single-crystalline silicon sidewalls to route a normally-incident beam in cavity oriented along the substrate plane. Gratings have been specifically diffract circularly polarized light first order, latter having angle matching (111) orientation. Then, length where interacts atoms can be extended. We...
Abstract The efficient light–matter interaction and discrete level structure of atomic vapors made possible numerous seminal scientific achievements including time-keeping, extreme non-linear interactions, strong coupling to electric magnetic fields in quantum sensors. As such, systems can be regarded as a highly resourceful material platform. Recently, the field thin optical elements with miniscule features has been extensively studied demonstrating an unprecedented ability control photonic...
A method for filling alkali vapor cells with cesium from a dispensing paste is proposed and its compliance miniature atomic clock applications evaluated. The an organic-inorganic composition of molybdate, zirconium-aluminum powder, hybrid binder. It compatible collective deposition processes such as micro-drop dispensing, which can be done under ambient atmosphere at the wafer-level. After sealing by anodic bonding, released consolidated through local heating high power laser. Linear...
Sub-Doppler spectroscopy in alkali-metal vapor cells using two counterpropagating dual-frequency laser beams allows the detection of high-contrast sign-reversed natural-linewidth sub-Doppler resonances. Previously, a qualitative theory based on simplified \ensuremath{\Lambda}-scheme model has been reported to explain underlying physics this phenomenon. In paper, an extended theoretical (DFSDS) for Cs ${D}_{1}$ line is reported. Taking into account real atomic energy structure, main...
Abstract We show that micro-machined non-evaporable getter pumps (NEGs) can extend the time over which laser cooled atoms be produced in a magneto-optical trap (MOT), absence of other vacuum pumping mechanisms. In first study, we incorporate silicon-glass microfabricated ultra-high (UHV) cell with silicon etched NEG cavities and alumino–silicate glass (ASG) windows demonstrate observation repeatedly-loading MOT 10 min period single laser-activated NEG. second capacity passive activated...
Light shifts are known to be an important limitation the mid- and long-term fractional frequency stability of different types atomic clocks. In this article, we demonstrate experimental implementation anti-light-shift interrogation protocol onto a continuous-wave (cw) microcell clock based on coherent population trapping (CPT). The method, inspired by autobalanced Ramsey spectroscopy technique demonstrated in pulsed clocks, consists extraction information from two successive light-shifted...
Abstract We demonstrate a new technique for filling mm-scale microfabricated silicon and glass cavities with alkali vapors at the wafer-scale. A single etched wafer contains an array of containing precursor materials offset laterally from cell array. The is heated to create droplets on upper wafer, which then translated under vacuum bonded cells. This can be implemented in commercially available bonding tool, allows fabrication cells arbitrary buffer gas contents pressures potentially...
Abstract Atomic devices such as atomic clocks and optically-pumped magnetometers rely on the interrogation of atoms contained in a cell whose inner content has to meet high standards purity accuracy. Glass-blowing techniques craftsmanship have evolved over many decades achieve macroscopic vapor cells. With emergence chip-scale devices, need for miniaturization mass fabrication led adoption microfabrication make millimeter-scale However, shortcomings remain no process been able match quality...
We report on the metrological characterization of novel commercially available 894.6 nm vertical-cavity surface-emitting lasers (VCSELs), dedicated to Cs D1 line spectroscopy experiments. The thermal behavior VCSELs is reported, highlighting existence a minimum threshold current and maximum output power in 55°C-60°C range. laser relative intensity noise, measured be -108 dB/Hz at 10 Hz Fourier frequency f for 25 μW, reduced with increased power. noise 108 Hz2/Hz f=100 Hz. spectral linewidth...
The demonstration of miniature atomic clocks (MACs) based on coherent population trapping (CPT) with improved mid- and long-term frequency stability benefits from the implementation additional stabilization loops to reduce temperature-induced light-shift effects. In this article, we report highlight individual combined such servo a CPT-based MAC. first loop stabilizes actual temperature vertical-cavity surface-emitting laser (VCSEL) chip using compensation method in which reading external...
We report the realization and characterization using coherent population trapping (CPT) spectroscopy of an octadecyltrichlorosilane (OTS)-coated centimeter-scale Cs vapor cell. The dual-structure resonance lineshape, with presence a narrow structure line at top Doppler-broadened structure, is clearly observed. linewidth compared to evacuated cell buffer gas similar size. Cs-OTS adsorption energy measured be (0.42 ± 0.03) eV, leading clock frequency shift rate 2.7 × 10−9/K in fractional unit....
The stability and accuracy of atomic devices can be degraded by the evolution their cell inner atmosphere. Hence, undesired entrance or leakage background buffer gas, respectively, that permeate through walls, should slowed down. In this work, we investigate helium permeation in microfabricated alkali vapor cells filled with He whose windows are made borosilicate glass (BSG) aluminosilicate (ASG). is then derived from routine measurements pressure-shifted hyperfine transition frequency an...
Abstract Pegylated silicon nanoparticles (SiNPs) are of great interest for applications in bio‐imaging as fluorescent tracers. Poly(ethylene glycol) (PEG) covalently attached to SiNPs may improve the (bio)compatibility, solubility water and stability SiNPs, without inhibiting their optical properties. first coated with silica followed by a silanization surface. Then, two versatile “grafting to” methods used provide pegylated SiNPs. Both peptide type coupling copper(I)‐catalyzed azide‐alkyne...
Laboratory optical atomic clocks achieve remarkable accuracy (now counted to 18 digits or more), opening possibilities explore fundamental physics and enable new measurements. However, their size use of bulk components prevent them from being more widely adopted in applications that require precision timing. By leveraging silicon-chip photonics for integration reduce component complexity, we demonstrate a compact optical-clock architecture. Here semiconductor laser is stabilized an...
Pulsed coherent population trapping (CPT) spectroscopy is applied in buffer-gas filled Cs–Ne vapor microfabricated cells. The properties of the Ramsey-CPT clock transition central fringe (linewidth, signal amplitude, and contrast) are studied versus several experimental parameters, including Ramsey sequence input laser intensity, compared to those obtained conventional continuous (CW) interrogation mode. In pulsed case for short Ramsey-free evolution times TR, linewidth found exhibit a small...
We report on the characterization of Cs vapor microfabricated cells filled with a Ne-He buffer gas mixture using coherent population trapping (CPT) spectroscopy. The temperature dependence clock frequency is found to be canceled at first order around so-called inversion higher than 80°C whose value depends partial pressure ratio. This could well-adapted for development miniature atomic clocks devoted used in specific applications such as defense and avionic systems high operating environment...
Stability and precision of atomic devices are closely tied to the quality stability internal atmosphere vapor cells on which they rely. Such can be stabilized by building cell with low permeation materials such as sapphire, or aluminosilicate glass in microfabricated devices. Recently, we showed that barriers made Al$_{2}$O$_{3}$ thin-film coatings deposited standard borosilicate could an alternative for buffer gas pressure stabilization. In this study, hence investigate how helium is...
Stability and precision of atomic devices are closely tied to the quality stability internal atmosphere vapor cells on which they rely. Such an can be stabilized by building cell with low permeation materials such as sapphire or aluminosilicate glass in microfabricated devices. Recently, we have shown that barriers made Al2O3 thin-film coatings deposited standard borosilicate could alternative for buffer gas pressure stabilization. In this study, we, hence, investigate how helium is...