Journal
APPLIED PHYSICS LETTERS
Volume 120, Issue 15, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0087391
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Funding
- U.S. Department of Commerce, National Institute of Standards and Technology [70NANB18H006]
- Russian Science Foundation [21-12-00057]
- Russian Foundation for Basic Research [2002-00505]
- Ministry of Education and Science of the Russian Federation [FSUS-2020-0036]
- Foundation for the Advancement of Theoretical Physics and Mathematics BASIS
- Russian Science Foundation [21-12-00057] Funding Source: Russian Science Foundation
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This letter investigates the impact of coherent population trapping (CPT) on microwave atomic clocks in atomic vapors. The authors demonstrate that nonlinear light shifts in CPT clocks can arise from spatially inhomogeneous CPT driving fields. The results provide insights for improving light shift mitigation techniques.
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 lambda-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.& nbsp;Published by AIP Publishing
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