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<p>We present an experimental and theoretical study of anisotropy-induced changes in probe transmission at two-photon resonance for the D<sub>2</sub> line of <sup>87</sup>Rb in presence of a longitudinal magnetic field, exploring the effects of varying ellipticity of pump and probe fields. We theoretically investigate how a change in polarization leads to a population redistribution, thereby creating anisotropy that results in a conversion between transmission and absorption. Our theoretical investigation involves solving the density matrix equations comprising of 13 and 16 levels respectively. The 13-level model, which excludes the <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(F'=1\)</EquationSource> </InlineEquation> excited state, exhibits symmetric conversion between transmission and absorption for both positive and negative ellipticity. In contrast, the 16-level model, which includes the <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(F'=1\)</EquationSource> </InlineEquation> manifold, displays a loss of symmetry, with absorption observed only for positive ellipticity. These theoretical predictions are supported by experimental measurements. Our findings provide insight into how optical anisotropy at two-photon resonance can be engineered through atomic structure and light polarization.</p>

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Anisotropy-induced absorption in a large Zeeman manifold

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Nayan Sharma,
  • Ranjit Kumar Singh,
  • Souvik Chatterjee,
  • Prasanta K. Panigrahi,
  • Ajay Tripathi

摘要

We present an experimental and theoretical study of anisotropy-induced changes in probe transmission at two-photon resonance for the D2 line of 87Rb in presence of a longitudinal magnetic field, exploring the effects of varying ellipticity of pump and probe fields. We theoretically investigate how a change in polarization leads to a population redistribution, thereby creating anisotropy that results in a conversion between transmission and absorption. Our theoretical investigation involves solving the density matrix equations comprising of 13 and 16 levels respectively. The 13-level model, which excludes the \(F'=1\) excited state, exhibits symmetric conversion between transmission and absorption for both positive and negative ellipticity. In contrast, the 16-level model, which includes the \(F'=1\) manifold, displays a loss of symmetry, with absorption observed only for positive ellipticity. These theoretical predictions are supported by experimental measurements. Our findings provide insight into how optical anisotropy at two-photon resonance can be engineered through atomic structure and light polarization.