Computational studies of light shift in a Raman-Ramsey interference-based atomic clock

G. S. Pati*, Z. Warren, N. Yu, M. S. Shahriar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Determining light shift in Raman-Ramsey (RR) interference is important for the development of atomic frequency standards based on a vapor cell. We have accurately calculated light shift in RR interference using the densitymatrix 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 RR 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 RR 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.

Original languageEnglish (US)
Pages (from-to)388-394
Number of pages7
JournalJournal of the Optical Society of America B: Optical Physics
Issue number3
StatePublished - Mar 1 2015

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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