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Subnatural linewidth in room-temperature Rb vapor using a control laser

Rapol, Umakant D and Wasan, Ajay and Natarajan, Vasant (2003) Subnatural linewidth in room-temperature Rb vapor using a control laser. In: Physical Review A (Atomic, Molecular, and Optical Physics), 67 (5). pp. 53802-1.


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We demonstrate two ways of obtaining subnatural linewidth for probe absorption through room-temperature Rb vapor. Both techniques use a control laser that drives the transition from a different ground state. The coherent drive splits the excited state into two dressed states (Autler-Townes doublet), which have asymmetric linewidths when the control laser is detuned from resonance. In the first technique, the laser has a large detuning of 1.18 GHz to reduce the linewidth to 5.1 MHz from the Doppler width of 560 MHz. In the second technique, we use a counterpropagating pump beam to eliminate the first-order Doppler effect. The unperturbed probe linewidth is about 13 MHz, which is reduced below 3 MHz (0.5) at a detuning of 11.5 MHz.

Item Type: Journal Article
Publication: Physical Review A (Atomic, Molecular, and Optical Physics)
Publisher: American Physical Society (APS)
Additional Information: Copyright for this article belongs to American Physical Society (APS).
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 10 Dec 2004
Last Modified: 19 Sep 2010 04:12
URI: http://eprints.iisc.ac.in/id/eprint/291

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