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

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.

Niharika Singh¹ Q V Lawande² R D’souza³ A Ray⁴ B N Jagatap^{1 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

Published

December 2010