TY - JOUR

T1 - Line Shape of the Sub-Doppler Resonance in Alkali-Metal Atomic Vapors in the Field of Counterpropagating Bichromatic Laser Beams

AU - Mikhailov, A. M.

AU - Boudot, R.

AU - Brazhnikov, D. V.

N1 - Funding Information: The work of A.M. Mikhailov and D.V. Brazhnikov was supported by the Russian Science Foundation (grant no. 17-72-20089) and the Russian Foundation for Basic Research (grant no. 20-02-00075). R. Boudot is grateful to Agence Nationale de la Recherche for support under project LabeX FIRST-TF (ANR grant no. 10-LABX-0048) Publisher Copyright: © 2021, Pleiades Publishing, Inc.

PY - 2021/12

Y1 - 2021/12

N2 - High-contrast sub-Doppler resonances observed in alkali-metal atomic vapors in the field of counterpropagating bichromatic laser beams are perspective in quantum metrology for designing a miniature optical frequency standard. Until now, these nonlinear resonances have been investigated only experimentally or using numerical calculations. In our opinion, the development of a simplified theoretical model of the observed resonances, which would provide explicit compact analytic expressions describing the line shape of the resonance, would be extremely important for further evolution of the theory. In this study, we perform such theoretical analysis based on the three-level Λ scheme of the atom. We investigate two regimes, viz., the regime of a low-intensity standing wave with close intensities of counterpropagating beams (I1 ≈ I2) and the regime of a probe wave, in which one of the beams has a noticeably lower intensity than that of the oppositely propagating beam (I2 ≪ I1). The resulting analytic expressions make it possible to determine qualitative differences between these regimes and to separate explicitly the contributions from different nonlinear effects to the light field absorption, including the terms responsible for the formation of a high-contrast sub-Doppler peak. The expressions derived here are in qualitative agreement with experimental data obtained earlier.

AB - High-contrast sub-Doppler resonances observed in alkali-metal atomic vapors in the field of counterpropagating bichromatic laser beams are perspective in quantum metrology for designing a miniature optical frequency standard. Until now, these nonlinear resonances have been investigated only experimentally or using numerical calculations. In our opinion, the development of a simplified theoretical model of the observed resonances, which would provide explicit compact analytic expressions describing the line shape of the resonance, would be extremely important for further evolution of the theory. In this study, we perform such theoretical analysis based on the three-level Λ scheme of the atom. We investigate two regimes, viz., the regime of a low-intensity standing wave with close intensities of counterpropagating beams (I1 ≈ I2) and the regime of a probe wave, in which one of the beams has a noticeably lower intensity than that of the oppositely propagating beam (I2 ≪ I1). The resulting analytic expressions make it possible to determine qualitative differences between these regimes and to separate explicitly the contributions from different nonlinear effects to the light field absorption, including the terms responsible for the formation of a high-contrast sub-Doppler peak. The expressions derived here are in qualitative agreement with experimental data obtained earlier.

UR - http://www.scopus.com/inward/record.url?scp=85123490123&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/9aa15125-ba58-3e09-87cb-c7ef7148e5f0/

U2 - 10.1134/S106377612112013X

DO - 10.1134/S106377612112013X

M3 - Article

AN - SCOPUS:85123490123

VL - 133

SP - 696

EP - 710

JO - Journal of Experimental and Theoretical Physics

JF - Journal of Experimental and Theoretical Physics

SN - 1063-7761

IS - 6

ER -