Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

The Japan Society of Applied Physics

Light Shift Chaarcteristics of Ramsey CPT Resonances Excited by Drive Current Modulation Method

Daisuke Haraguchi, Masahiro Fukuoka, Shigeyoshi Goka

Published Jul 10, 2018• 0 citations
OpenAlex

Related papers

Removing Light Shift in Ramsey-Coherent Population Trapping Resonance with Different Free Evolution Time

Masahiro Fukuoka, Hiroyuki Gamou, Shigeyoshi Goka

URSI General Assembly and Scientific Symposium•Jan 1, 2023•0 citations

Light modulation by a magnetic resonance in a paramagnet

Andrei V. Butashin, S. O. Demokritov, Natalia M. Kreines +1 more

ZhETF Pisma Redaktsiiu•Nov 1, 1983•0 citations

Light shift of Ramsey coherent population trapping resonance using drive current modulation

Masahiro Fukuoka, Shigeyoshi Goka, Masatoshi Kajita +1 more

Abstract We investigated the light shift of Ramsey coherent population trapping (CPT) resonance by drive current modulation (DCM), which can be realized with low power consumption in a small system, to improve the performance of a CPT atomic clock. The light shift makes the greatest contribution to the degradation of long-term frequency stability of a CPT atomic clock. We also devised digitizer-based DCM to reduce the uncertainty in the frequency of light shift due to wavelength variation at the time of observation. The results show that light shift with DCM is reduced compared with cw excitation and is consistent with theoretical calculations. The estimated frequency uncertainty of the light shift due to wavelength variation using the proposed method is 2.1 × 10−13, which is approximately 165 times better than that of the conventional method without a digitizer, thus demonstrating the effectiveness of the proposed method for future small atomic clocks.

Japanese Journal of Applied Physics•Nov 16, 2023•5 citations

Estimation of a Light Shift Using Various Atomic Resonances in Ramsey-Coherent Population Trapping Sequence

Masahiro Fukuoka, Sigeyoshi Goka

This study aimed to detect the light shift by utilizing various atomic resonances observed under pulsed excitation with drive current modulation (DCM). Light shift degrades the performance of atomic clocks, and several studies have attempted to mitigate or correct it. Pulsed excitation with DCM facilitates the observation of various Ramsey-coherent population trapping (CPT) resonances owing to wavelength variation. Further, in the Ramsey-CPT sequence, a semi-continuous wave CPT resonance (SCW-CPT resonance), which is a continuous wave CPT resonance from pulsed lasers, is also observed. As these atomic resonances exhibit different frequency sensitivities to laser intensity, the frequency shifts differ based on the changes in laser intensity. This facilitates the detection of the light shift. By simultaneously measuring the resonance frequencies of two Ramsey-CPT resonances and the SCW-CPT resonance while varying the laser intensity to induce light shifts, we measured the resulting frequency changes. Each resonance exhibited a different frequency shift in response to the light shift. Therefore, this study conformed the feasibility of detecting and estimating the light shift in an operational atomic clock.

IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium (UFFC-JS)•Sep 22, 2024•0 citations

Line shapes in modulation resonance

A. Kopystyńska

Il Nuovo cimento della Società italiana di fisica. B/Il Nuovo cimento B•May 1, 1971•2 citations

Non-linear ramsey resonance in the optical region

Ye. V. Baklanov, B. Dubetsky, Veniamin P. Chebotayev

Applied Physics A•Feb 1, 1976•165 citations
Abstract We investigated the light shift of Ramsey coherent population trapping (CPT) resonance by drive current modulation (DCM), which can be realized with low power consumption in a small system, to improve the performance of a CPT atomic clock. The light shift makes the greatest contribution to the degradation of long-term frequency stability of a CPT atomic clock. We also devised digitizer-based DCM to reduce the uncertainty in the frequency of light shift due to wavelength variation at the time of observation. The results show that light shift with DCM is reduced compared with cw excitation and is consistent with theoretical calculations. The estimated frequency uncertainty of the light shift due to wavelength variation using the proposed method is 2.1 × 10−13, which is approximately 165 times better than that of the conventional method without a digitizer, thus demonstrating the effectiveness of the proposed method for future small atomic clocks.
This study aimed to detect the light shift by utilizing various atomic resonances observed under pulsed excitation with drive current modulation (DCM). Light shift degrades the performance of atomic clocks, and several studies have attempted to mitigate or correct it. Pulsed excitation with DCM facilitates the observation of various Ramsey-coherent population trapping (CPT) resonances owing to wavelength variation. Further, in the Ramsey-CPT sequence, a semi-continuous wave CPT resonance (SCW-CPT resonance), which is a continuous wave CPT resonance from pulsed lasers, is also observed. As these atomic resonances exhibit different frequency sensitivities to laser intensity, the frequency shifts differ based on the changes in laser intensity. This facilitates the detection of the light shift. By simultaneously measuring the resonance frequencies of two Ramsey-CPT resonances and the SCW-CPT resonance while varying the laser intensity to induce light shifts, we measured the resulting frequency changes. Each resonance exhibited a different frequency shift in response to the light shift. Therefore, this study conformed the feasibility of detecting and estimating the light shift in an operational atomic clock.