Observation of coherent population trapping in a V-type two-electron system

Singh, Alok K and Natarajan, Vasant (2015) Observation of coherent population trapping in a V-type two-electron system. In: NEW JOURNAL OF PHYSICS, 17 .

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Abstract

We observe coherent population trapping (CPT) in a two-electron atom-Yb-174-using the S-1(0), F= 0 -> P-3(1), F `= 1 transition. CPT is not possible for such a transition according to one-electron theory because the magnetic sublevels form a V-type system, but in a two-electron atom like Yb, the interaction of the electrons transforms the level structure into a V-type system, which allows the formation of a dark state and hence the observation of CPT. Since the two levels involved are degenerate, we use a magnetic field to lift the degeneracy. The single fluorescence dip then splits into five dips-the central unshifted one corresponds to coherent population oscillation, while the outer four are due to CPT. The linewidth of the CPT resonance is about 300 kHz and is limited by the natural linewidth of the excited state, which is to be expected because the excited state is involved in the formation of the dark state.

Item Type:	Journal Article
Publication:	NEW JOURNAL OF PHYSICS
Publisher:	IOP PUBLISHING LTD
Additional Information:	Copy right for this article belongs to the IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Keywords:	coherent population trapping; V-type system; two-electron atom; intercombination line
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	13 May 2015 07:16
Last Modified:	13 May 2015 07:16
URI:	http://eprints.iisc.ac.in/id/eprint/51520

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