Document Type

Article

Publication Date

Spring 5-16-2003

Publication Title

Physical Review Letters

ISSN

0031-9007

Volume

90

Issue

19

First Page

193002-1

Last Page

193002-4

DOI

10.1103/PhysRevLett.90.193002

Abstract

We report the first experimental study of sub-Doppler cooling in alkaline earth atoms (87Sr) enabled by the presence of nuclear spin-originated magnetic degeneracy in the atomic ground state. Sub-Doppler cooling in a σ+configuration is achieved despite the presence of multiple, closely spaced excited states. This surprising result is confirmed by an expanded multilevel theory of the radiative cooling force. Detailed investigations of system performance have shed new insights into (σ+) cooling dynamics and will likely play an important role in the future development of neutral atom-based optical frequency standards.

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