Computational Studies of Light Shift in Raman-Ramsey Interference-Based Atomic Clock

Abstract

Determining light shift in Raman-Ramsey interference is important for the development of atomic frequency standards based on a vapor cell. We have accurately calculated light shift in Raman-Ramsey interference using the density-matrix equations for a three-level system without invoking the adiabatic approximation. Specifically, phase shifts associated with coherent density-matrix terms are studied as they are relevant to the detection of Raman-Ramsey interference in transmission (or absorption) through the medium. For the single-velocity case, the numerically computed results are compared with the analytical results obtained using the adiabatic approximation. The result shows light shift suppression in conformity with the closed-form analytic solutions. The computational studies have also been extended to investigate Raman-Ramsey interference for a Doppler-broadened vapor medium. Importantly, a velocity-induced frequency shift is found at the fringe center as an additional source of frequency error for a vapor cell Raman clock.

19 pages, 8 figures

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• Simple method of light-shift suppression in optical pumping systems
• Ramsey spectroscopy of high-contrast CPT resonances with push-pull optical pumping in Cs vapor
• Ultra-high Resolution Spectroscopy with atomic or molecular Dark Resonances: Exact steady-state lineshapes and asymptotic profiles in the adiabatic pulsed regime
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Cited by in corpus (10)

• A high-performance Raman-Ramsey Cs vapor cell atomic clock
• Generalized auto-balanced Ramsey spectroscopy of clock transitions
• Ramsey Spectroscopy with Displaced Frequency Jumps
• AC Stark Shifts of Dark Resonances Probed with Ramsey Spectroscopy
• Combined error signal in Ramsey spectroscopy of clock transitions
• Adaptive cold-atom magnetometry mitigating the trade-off between sensitivity and dynamic range
• Effect of atomic diffusion on the Raman-Ramsey CPT resonances
• Spin Squeezing Induced Enhancement of Sensitivity of an Atomic Clock using Coherent Population Trapping
• Doppler Shift Mitigation in a Chip-Scale Atomic Beam Clock
• Addition to the dynamic Stark shift of the coherent population trapping resonance