Claudio Calosso
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View article: Frequency Shifts in a Coherent Population Trapping Cs Vapor Cell Atomic Clock
Frequency Shifts in a Coherent Population Trapping Cs Vapor Cell Atomic Clock Open
We report on measurements of frequency shifts in a microwave cesium vapor cell atomic clock based on coherent population trapping (CPT). The dependence of the clock frequency on numerous experimental parameters, such as the laser power, th…
View article: An Accessible Formulation for Defining the SI Second Based on Multiple Atomic Transitions
An Accessible Formulation for Defining the SI Second Based on Multiple Atomic Transitions Open
The atomic transitions employed in the best of today's optical clocks are a strong foundation for the upcoming redefinition of the SI second. Including multiple transitions in the definition offers increased accuracy, a robust diversity of…
View article: Laser-frequency stabilization using light shift in compact atomic clocks
Laser-frequency stabilization using light shift in compact atomic clocks Open
This paper describes the light-shift laser-lock (LSLL) technique, an alternative method intended for laser-based compact atomic clocks. The technique greatly simplifies the laser setup by stabilizing the pumping-laser frequency to the same…
View article: Laser Frequency Stabilization Using Light Shift in Compact Atomic Clocks
Laser Frequency Stabilization Using Light Shift in Compact Atomic Clocks Open
This paper describes the Light-Shift Laser-Lock (LSLL) technique, a novel method intended for compact atomic clocks that greatly simplifies the laser setup by stabilizing the pumping-laser frequency to the atoms involved in the clock, with…
View article: A cryogenic sapphire resonator oscillator with 10−16 mid-term fractional frequency stability
A cryogenic sapphire resonator oscillator with 10−16 mid-term fractional frequency stability Open
We report in this Letter the outstanding frequency stability performance of an autonomous cryogenic sapphire oscillator (CSO) presenting a flicker frequency noise floor below 2×10−16 near 1000 s of integration time and a long-term Allan de…
View article: The Digital Revolution, also for Time Scales
The Digital Revolution, also for Time Scales Open
This work focuses on the generation of a composite clock for time scales and shows the advantages of a more recent digital approach with respect to a traditional analog one. A digital approach directly processes the information contained i…
View article: A Cryogenic Sapphire Oscillator with 10−16 mid-term ADEV
A Cryogenic Sapphire Oscillator with 10−16 mid-term ADEV Open
International audience
View article: Recent Results on a Rb Pulsed Optically Pumped Clock for Space Applications
Recent Results on a Rb Pulsed Optically Pumped Clock for Space Applications Open
We report on the recent characterization of a Rb microwave clock based on the pulsed optical pumping (POP) principle. The clock is developed in the frame of a INRIM-Leonardo collaboration intended to implement a highly stable and compact d…
View article: Measurements of frequency shifts in a high-performance CPT-based cesium cell atomic clock
Measurements of frequency shifts in a high-performance CPT-based cesium cell atomic clock Open
International audience
View article: A Cryogenic Sapphire Resonator Oscillator with 1e-16 mid-term fractional frequency stability
A Cryogenic Sapphire Resonator Oscillator with 1e-16 mid-term fractional frequency stability Open
We report in this letter the outstanding frequency stability performances of an autonomous cryogenique sapphire oscillator presenting a flicker frequency noise floor below 2e-16 near 1,000 s of integration time and a long term Allan Deviat…
View article: Direct Measurement of Laser Noise Spectrum with a Frequency-to-Voltage Converter
Direct Measurement of Laser Noise Spectrum with a Frequency-to-Voltage Converter Open
The stability performance of laser-pumped Rb-cell atomic clocks is affected by the laser spectral characteristics. It is then important to investigate the laser spectrum, especially since laser noise measurements are rarely found in the li…
View article: Tackling light-shifts in a microcell atomic clock with Symmetric Auto-Balanced Ramsey
Tackling light-shifts in a microcell atomic clock with Symmetric Auto-Balanced Ramsey Open
International audience
View article: Frequency-doubled Laser System at 780 nm for Pulsed Vapor-cell Clocks
Frequency-doubled Laser System at 780 nm for Pulsed Vapor-cell Clocks Open
We present the development status of a low-noise pulsed laser source suitable for high-performing vapor-cell clocks. The laser is based on a 1560 nm source, frequency doubled to be resonant with the D-2 line of rubidium at 780 nm. The lase…
View article: Frequency characterization of diode lasers for vapor-cell clocks applications
Frequency characterization of diode lasers for vapor-cell clocks applications Open
The knowledge of the frequency noise spectrum of a diode laser is of interest in several high resolution ex- periments. Specifically, in laser-pumped vapor cell clocks, it is well established that the laser frequency noise plays a role in …
View article: Light-shift mitigation in a microcell-based atomic clock with symmetric auto-balanced Ramsey spectroscopy
Light-shift mitigation in a microcell-based atomic clock with symmetric auto-balanced Ramsey spectroscopy Open
The mid-term fractional frequency stability of miniaturized atomic clocks can be limited by light-shift effects. In this Letter, we demonstrate the implementation of a symmetric auto-balanced Ramsey (SABR) interrogation sequence in a micro…
View article: All-optical microwave feedback oscillator with atomic cell resonator
All-optical microwave feedback oscillator with atomic cell resonator Open
We report the demonstration of an all-optical self-sustained cell-based microwave feedback oscillator. In this scheme, a microwave resonance, optically induced in a buffer-gas filled vapor cell resonator through coherent population trappin…
View article: All-optical microwave feedback oscillator with atomic cell resonator
All-optical microwave feedback oscillator with atomic cell resonator Open
International audience
View article: Frequency Noise Characterization of Diode Lasers for Vapor-Cell Clock Applications
Frequency Noise Characterization of Diode Lasers for Vapor-Cell Clock Applications Open
The knowledge of the frequency noise spectrum of a diode laser is of interest in several high-resolution experiments. Specifically, in laser-pumped vapor-cell clocks, it is well-established that the laser frequency noise plays a role in af…
View article: New Microwave Power Control Technique By Light Shift Detection In The DM-CPT Clock
New Microwave Power Control Technique By Light Shift Detection In The DM-CPT Clock Open
International audience
View article: Studies on the mid-term effects of the double-modulation CPT clock
Studies on the mid-term effects of the double-modulation CPT clock Open
International audience
View article: Kr-Based Buffer Gas for Rb Vapor-Cell Clocks
Kr-Based Buffer Gas for Rb Vapor-Cell Clocks Open
Optically pumped Rb vapor cell clocks are by far the most used devices for timekeeping in all ground and space applications. The compactness and the robustness of this technology make Rb clocks extremely well fit to a large number of appli…
View article: Loaded Microwave Cavity for Compact Vapor-Cell Clocks
Loaded Microwave Cavity for Compact Vapor-Cell Clocks Open
Vapor-cell devices based on microwave interrogation provide a stable frequency reference with a compact and robust setup. Further miniaturization must focus on optimizing the physics package, containing the microwave cavity and atomic rese…
View article: Protocol for light-shift compensation in a continuous-wave microcell atomic clock
Protocol for light-shift compensation in a continuous-wave microcell atomic clock Open
International audience
View article: Intensity Detection Noise in Pulsed Vapor-Cell Frequency Standards
Intensity Detection Noise in Pulsed Vapor-Cell Frequency Standards Open
Laser intensity noise is currently recognized as one of the main factors limiting the short-term stability of vapor-cell clocks. In this article, we propose a signal theory approach to estimate the contribution of the laser intensity fluct…