Inhomogeneous light shifts of coherent population trapping resonances

J. W. Pollock, V. I. Yudin, A. V. Taichenachev, M. Yu Basalaev, D. V. Kovalenko, A. Hansen, J. Kitching, W. R. McGehee

Research output: Contribution to journalArticlepeer-review

Abstract

Coherent population trapping (CPT) in atomic vapors using all-optical interrogation has enabled the miniaturization of microwave atomic clocks. Light shifts induced by the CPT driving fields can impact the spectral profile of CPT resonances and are a common limit to the long-term stability of CPT clocks. Nonlinear light shifts have been observed in several CPT systems and have not been explored in detail. In this Letter, we demonstrate that nonlinear light shifts in CPT clocks can arise from spatially inhomogeneous CPT driving fields. We measure this effect using Gaussian laser beams in a buffer gas cell and show strong agreement with a four-level model describing the CPT Λ-system with a noninteracting "trap"state. We estimate the effect of this nonlinearity on recently developed light shift mitigation techniques and suggest improvements to existing techniques.

Original languageEnglish
Article number154001
JournalApplied Physics Letters
Volume120
Issue number15
DOIs
Publication statusPublished - 11 Apr 2022

OECD FOS+WOS

  • 1.03 PHYSICAL SCIENCES AND ASTRONOMY

Fingerprint

Dive into the research topics of 'Inhomogeneous light shifts of coherent population trapping resonances'. Together they form a unique fingerprint.

Cite this