A5082810184- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Advanced Frequency and Time Standards
- Advanced MRI Techniques and Applications
- Cold Atom Physics and Bose-Einstein Condensates
Université de franche-comté
2023-2024
Franche-Comté Électronique Mécanique Thermique et Optique - Sciences et Technologies
2022-2024
Centre National de la Recherche Scientifique
2022-2024
École Nationale Supérieure de Mécanique et des Microtechniques
2024
Université Bourgogne Franche-Comté
2022
We report on the operation of a coherent population trapping (CPT) microcell atomic clock using pulsed Ramsey-like interrogation. The Ramsey-CPT sequence, defined by two-step optical pulses separated free-evolution dark time, is produced switching and off output power low-power vertical-cavity surface-emitting laser, through direct modulation its driving current. High-contrast narrow fringes are detected without use any external modulator stage. demonstrate closed-loop based high-speed...
The mid-term fractional frequency stability of miniaturized atomic clocks can be limited by light-shift effects. In this Letter, we demonstrate the implementation a symmetric auto-balanced Ramsey (SABR) interrogation sequence in microcell-based clock based on coherent population trapping. Using advanced protocol, sensitivity to laser power, microwave and variations is reduced, at least one order magnitude, comparison with continuous-wave or schemes. Light-shift mitigation obtained SABR...
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...
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...
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...