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AIP conference proceedings

Dephasing-induced coherences: higher-order selection rules and experiments in a magnetic field

Larry A. Rahn, Rick P. Trebino

Published Jan 1, 1988• 0 citations
Publisher

Abstract

We observe dephasing‐induced third‐and higher‐order wave‐mixing spectra of Zeeman and hyperfine coherences in a sodium‐seeded flame in a magnetic field. As the perturbation parameter approaches unity, we compare our experimental spectra with theoretical higher‐order selection rules.
DOI
10.1063/1.37371

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Dephasieg-induced phenomena are a novel class of effects that are ordinarily forbidden because the two or more relevant quantum-mechanical amplitudes add coherently and cancel out.1 When dephasing is present, however, these amplitudes no longer cancel, and previously unseen effects can be observed. Indeed, a number of novel dephasing-induced phenomena have been seen.2-5 Of particular interest, both for fundamental reasons and for diagnostic purposes, are (third-order) dephasing-induced resonances between equally populated levels of a ground electronic state,6,7 specifically, Zeeman and hyperfine coherences. Working with a sodium-seeded flame, we8 have observed these latter effects and, at higher intensities, subharmonics of them.
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