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

Niharika Singh, Q. V. Lawande, R. D'Souza, A. Ray, B. N. Jagatap

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5 Scopus citations


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 Λ 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 Λ system 52S1/2F = 1, 2 → 52P 3/2F′ = 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.

Original languageEnglish
Pages (from-to)1151-1155
Number of pages5
JournalPramana - Journal of Physics
Issue number6
StatePublished - Dec 2010
Externally publishedYes


  • Atomic coherence and interference
  • Electromagneti- cally-induced transparency
  • Subnatural linewidth


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