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<p>Sub-Doppler resonances formed by scanning the laser frequency in the region of the 4<i>S</i><sub>1/2</sub> → 4<i>P</i><sub>1/2</sub> transition at a wavelength of 770 nm in K atomic vapors placed in a nanocell were studied. Sub-Doppler resonances located at the unshifted atomic transitions F<sub>g</sub> = 1, 2 → F<sub>e</sub> = 1, 2 were formed in the transmission spectrum for atomic vapor thicknesses L = λ/2 = 385 nm and L = λ = 770 nm. The resonance amplitudes observed in the nanocell were proportional to the probability amplitudes of the corresponding transitions. It is shown that a nanocell with a vapor thickness L = λ = 770 nm could be used as a convenient frequency reference tied to the unshifted frequencies of the atomic transitions. The advantages of the proposed frequency reference over a commonly used frequency reference based on saturated absorption techniques were demonstrated.</p>

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Atomic Frequency Reference Based on 4S1/2−4P1/2 Transitions in Potassium Vapor Placed in a Nanocell

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • A. Sargsyan

摘要

Sub-Doppler resonances formed by scanning the laser frequency in the region of the 4S1/2 → 4P1/2 transition at a wavelength of 770 nm in K atomic vapors placed in a nanocell were studied. Sub-Doppler resonances located at the unshifted atomic transitions Fg = 1, 2 → Fe = 1, 2 were formed in the transmission spectrum for atomic vapor thicknesses L = λ/2 = 385 nm and L = λ = 770 nm. The resonance amplitudes observed in the nanocell were proportional to the probability amplitudes of the corresponding transitions. It is shown that a nanocell with a vapor thickness L = λ = 770 nm could be used as a convenient frequency reference tied to the unshifted frequencies of the atomic transitions. The advantages of the proposed frequency reference over a commonly used frequency reference based on saturated absorption techniques were demonstrated.