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Polarization-rotation resonances with subnatural widths using a control laser

Chanu, Sapam Ranjita and Pandey, Kanhaiya and Bharti, Vineet and Wasan, Ajay and Natarajan, Vasant (2014) Polarization-rotation resonances with subnatural widths using a control laser. In: EPL, 106 (4).

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Official URL: http://dx.doi.org/10.1209/0295-5075/106/43001


We demonstrate extremely narrow resonances for polarization rotation in an atomic vapor. The resonances are created using a strong control laser on the same transition, which polarizes the atoms due to optical pumping among the magnetic sublevels. As the power in the control laser is increased, successively higher-order nested polarization-rotation resonances are created, with progressively narrower linewidths. We study these resonances in the D-2 line of Rb in a room temperature vapor cell, and demonstrate a width of 0.14 G for the third-order rotation. The physical basis for the observed resonances is that optical pumping results in a simplified. AV-type level structure with differential dressing of the levels by the control laser, which is why the control power has to be sufficiently high for each resonance to appear. This explanation is borne out by a density-matrix analysis of the system. The dispersive lineshape and subnatural width of the resonance lends itself naturally to applications such as laser locking to atomic transitions and precision measurements. Copyright (c) EPLA, 2014

Item Type: Journal Article
Publication: EPL
Additional Information: Copyright for this article belongs to the EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY, 6 RUE DES FRERES LUMIERE, MULHOUSE, 68200, FRANCE
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 25 Jul 2014 10:23
Last Modified: 25 Jul 2014 10:23
URI: http://eprints.iisc.ac.in/id/eprint/49442

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