Suppression of Dick Effect in Ramsey-CPT Atomic Clock by Interleaving Lock

Area of Science:

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

Background:

• The Dick effect is a primary limitation on the short-term frequency stability of pulsed atomic clocks.
• Traditional methods to mitigate this effect involve improving local oscillators, which is often complex and costly.

Purpose of the Study:

• To demonstrate the effectiveness of the interleaving lock technique in suppressing the Dick effect.
• To improve the short-term frequency stability of a pulsed Ramsey-coherent population trapping clock.

Main Methods:

• Implementation of the interleaving lock technique in a Ramsey-Dicke spectroscopy setup.
• Utilizing two identical Cesium (Cs) atomic ensembles for clock operation.
• Experimental measurement of Allan deviation to quantify frequency stability.

Main Results:

• Successful suppression of the Dick effect was achieved using the interleaving lock technique.
• Theoretically, the Dick effect is predicted to be reduced by a factor of 24.
• Measured short-term Allan deviation improved from [initial value] at 1 s to [final value] at 1 s.
• The Allan deviation curve exhibited a slope from 0.01 to 2 s, indicating enhanced stability over this averaging time.

Conclusions:

• The interleaving lock technique is a viable and effective method for suppressing the Dick effect in pulsed atomic clocks.
• This technique offers a practical approach to enhance short-term frequency stability without requiring superior local oscillators.
• The demonstrated clock shows significant improvements in frequency stability, particularly in the critical 0.01 to 2 s averaging time range.