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Abstract <p>Doppler-free resonance of the <sup>87</sup>Rb D1 line induced by bichromatic counter-propagating waves with different intensity ratios of the two resonant spectral components is investigated. It is shown that the maximal amplitude is achieved at unequal intensities for the low-frequency eigen and crossover resonances, and at equal intensities for the high-frequency eigen resonance. Measurements of the <i>Q</i>-factor (the contrast-to-width ratio) demonstrate that for all studied resonances, its maximal value is attained at an intensity ratio different from 1. For the low-frequency eigen resonance, the maximal <i>Q</i>-factor enhances by a factor of six at an intensity ratio of 5 as compared to the case of equal intensities.</p>

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Influence of Intensity Ratio of Resonant Spectral Components on Q-Factor of Dual-Frequency Doppler-Free Resonance in 87Rb Atoms

  • 期刊论文

  • 发表日期：

    2026年5月1日

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  • K. M. Sabakar,
  • E. A. Tsygankov,
  • D. S. Chuchelov,
  • M. I. Vaskovskaya,
  • S. A. Zibrov,
  • V. V. Vassiliev,
  • V. L. Velichansky

摘要

Abstract

Doppler-free resonance of the 87Rb D1 line induced by bichromatic counter-propagating waves with different intensity ratios of the two resonant spectral components is investigated. It is shown that the maximal amplitude is achieved at unequal intensities for the low-frequency eigen and crossover resonances, and at equal intensities for the high-frequency eigen resonance. Measurements of the Q-factor (the contrast-to-width ratio) demonstrate that for all studied resonances, its maximal value is attained at an intensity ratio different from 1. For the low-frequency eigen resonance, the maximal Q-factor enhances by a factor of six at an intensity ratio of 5 as compared to the case of equal intensities.