• Niharika Singh

Articles written in Pramana – Journal of Physics

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

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.

• # Pramana – Journal of Physics

Volume 94, 2020
All articles
Continuous Article Publishing mode

• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019