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      https://www.ias.ac.in/article/fulltext/pram/075/06/1151-1155

    • Keywords

       

      Atomic coherence and interference; subnatural linewidth; electromagnetically-induced transparency.

    • Abstract

       

      We investigate theoretically the pump-probe spectroscopy of coherently-driven four-level 𝛬 system with two closely spaced excited common levels, thereby forming a double $\Lambda$ system. Using the master equation approach, analytical results are obtained for the absorption spectrum of a weak probe in the presence of a strong pump. The model is applied to the double $\Lambda$ system $5^{2} S_{1/2} F = 1, 2 \rightarrow 5^{2} P_{3/2} F' = 1, 2$ of 87Rb atom. It is shown that the absorption spectrum consists of a triplet, of which one resonance is of sub-natural linewidth depending on the atom–field interaction parameters. The effect of Doppler broadening on the absorption spectrum is also investigated.

    • Author Affiliations

       

      Niharika Singh1 Q V Lawande2 R D’souza3 A Ray4 B N Jagatap1 3

      1. Homi Bhabha National Institute, Bhabha Atomic Research Centre, Mumbai 400 085, India
      2. Theoretical Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
      3. Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
      4. Laser & Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
    • Dates

       
  • Pramana – Journal of Physics | News

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