Light shift suppression with pulsed light detection in magnetic-state-selected cesium beam clocks

Area of Science:

• Atomic, Molecular, and Optical Physics
• Metrology and Measurement Science

Background:

• Light detection is crucial for atomic clocks, but conventional continuous light methods cause light shifts, degrading clock stability.
• Light shifts, arising from light-matter interactions, are a primary limitation for achieving high long-term stability in atomic clocks.

Purpose of the Study:

• To introduce and validate a novel pulsed light detection method for suppressing light shifts in atomic clocks.
• To enhance the long-term stability and robustness of atomic clocks against laser power fluctuations.

Main Methods:

• Implemented a pulsed light sequence for detecting atomic states, designed to minimize simultaneous interaction with light and microwave fields.
• Demonstrated the method in a magnetic-state-selected cesium beam atomic clock.
• Quantified the reduction in the light shift coefficient compared to continuous light detection.

Main Results:

• Reduced the light shift coefficient by approximately a factor of 10 compared to continuous light detection.
• Demonstrated good immunity to laser power fluctuations under pulsed detection.
• Analyzed short-term stability limitations, including the Dick effect and reduced atom detection efficiency.

Conclusions:

• Pulsed light detection is an effective strategy for mitigating light shifts and improving atomic clock stability.
• The developed method offers enhanced resilience to environmental noise, particularly laser power fluctuations.
• Further analysis of short-term stability factors is necessary for optimizing pulsed detection schemes in atomic clocks.