Coherent population trapping in a Λ configuration coupled by magnetic dipole interactions

Huidong Kim, Hyok Sang Han, Tai Hyun Yoon, Donghyun Cho

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We report our study on coherent population trapping (CPT) in a Λ configuration coupled by magnetic dipole interactions. The Λ configuration is formed by bichromatic radio-frequency fields coupling a pair of Zeeman sublevels in one hyperfine level of an alkali-metal atom to another sublevel in the other hyperfine level. The Zeeman sublevel at the apex is coupled to a state in the nP manifold via an optical transition on one of the spectroscopic D lines to induce optical pumping to a dark state. The configuration is closed without leakage to other Zeeman sublevels. We use lithium atoms in an optical trap for our experimental study. The system allows independent control of the main parameters characterizing CPT, which include the upper-state decay rate and the decoherence rate as well as the Rabi frequencies. By turning off the applied fields, the system is frozen so that its quantum state can be measured precisely. We studied the line shapes and dynamics of the CPT system, and measured the phase relation of the dark superposition state to find excellent agreement with theory. The possible application of the scheme as a method to cool optically trapped atoms below the recoil limit in a manner analogous to velocity-selective coherent population trapping is discussed.

Original languageEnglish
Article number032507
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume89
Issue number3
DOIs
Publication statusPublished - 2014 Mar 10

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magnetic dipoles
trapping
configurations
interactions
atoms
D lines
optical pumping
optical transition
alkali metals
decay rates
line shape
radio frequencies
apexes
leakage
lithium
traps

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Coherent population trapping in a Λ configuration coupled by magnetic dipole interactions. / Kim, Huidong; Han, Hyok Sang; Yoon, Tai Hyun; Cho, Donghyun.

In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 89, No. 3, 032507, 10.03.2014.

Research output: Contribution to journalArticle

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