• B N Jagatap

      Articles written in Pramana – Journal of Physics

    • Sub-natural linewidth resonances in coherently-driven double 𝛬 system

      Niharika Singh Q V Lawande R D’souza A Ray B N Jagatap

      More Details Abstract Fulltext PDF

      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.

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