Observation of sub-kilohertz resonance in Rf-optical double resonance experiment in rare earth ions in solids

M. K. Kim*, B. S. Ham, P. R. Hemmer, M. S. Shahriar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We have observed kilohertz and sub-kilohertz resonance structures in RF-optical double resonance experiments of rare-earth-doped solids, when the frequency of the RF field is scanned across the hyperfine transitions while monitoring the resonant optical absorption of a CW laser. The effect is observed only when the laser spectral width is broad compared to the hyperfine structure. The observed line widths are apparently free of the inhomogeneous widths of hyperfine levels and the line shape has peculiar double peak structure. The effect is modelled with a resonance involving three atomic levels interacting with three electromagnetic fields, two optical and one RF, in a triangular or 'delta' configuration. While the ordinary optical-RF two-field resonance is limited by spin inhomogeneous width, the simultaneous excitation of three coupled transitions leads to narrow and highly nonlinear resonance structures that are not averaged by the inhomogeneous distribution of hyperfine transition.

Original languageEnglish (US)
Pages (from-to)1713-1728
Number of pages16
JournalJournal of Modern Optics
Volume47
Issue number10
DOIs
StatePublished - Aug 15 2000

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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