Intensity nonlinearity of the error-signal frequency shift in the modulation spectroscopy of dark resonances and approaches to its reduction

2020/12/26 by E. A. Tsygankov, Tsygankov, E. A., Sergey Petropavlovsky +13
Biochemistry, Genetics and Molecular Biology · Neuroscience · Physics and Astronomy · #Atomic Physics (physics.atom-ph) #FOS: Physical sciences #Photoreceptor and optogenetics research #Quantum Physics (quant-ph) #Spectroscopy Techniques in Biomedical and Chemical Research #Spectroscopy and Quantum Chemical Studies

paper · pdf · doi:10.48550/arxiv.2012.13731

openalex publication_date 2020/12/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We have found that the error-signal frequency corresponding to the coherent population trapping resonance can be displaced from that of "0-0" transition unperturbed by the optical field, although the frequency is not sensitive to changes in its intensity. We consider the double Λ-system of levels interacting with the asymmetric polychromatic optical field to demonstrate that this effect arises due to intensity nonlinearity of the error-signal frequency shift. The experiment with ⁸⁷Rb atoms in Ar-N₂ buffer gas atomic cell shows how the displacement value depends on different parameters. The possible influence of the effect on the clocks' frequency stability and reproducibility are discussed.

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