High-contrast sub-Doppler absorption spikes in a hot atomic vapor cell exposed to a dual-frequency laser field

Moustafa Abdel Hafiz, Denis Brazhnikov, Grégoire Coget, Alexei Taichenachev, Valeriy Yudin, Emeric De Clercq, Rodolphe Boudot

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The saturated absorption technique is an elegant method widely used in atomic and molecular physics for high-resolution spectroscopy, laser frequency standards and metrology purposes. We have recently discovered that a saturated absorption scheme with a dual-frequency laser can lead to a significant sign reversal of the usual Doppler-free dip, yielding a deep enhanced-absorption spike. In this paper, we report detailed experimental investigations of this phenomenon, together with a full in-depth theoretical description. It is shown that several physical effects can support or oppose the formation of the high-contrast central spike in the absorption profile. The physical conditions for which all these effects act constructively and result in very bright Doppler-free resonances are revealed. Apart from their theoretical interest, results obtained in this manuscript are of great interest for laser spectroscopy and laser frequency stabilization purposes, with applications in laser cooling, matter-wave sensors, atomic clocks or quantum optics.

Original languageEnglish
Article number073028
Number of pages26
JournalNew Journal of Physics
Volume19
Issue number7
DOIs
Publication statusPublished - 25 Jul 2017

Keywords

  • coherent population trapping
  • Doppler-free spectroscopy
  • dual-frequency laser
  • Hanle effect
  • optical pumping
  • vapor cell
  • D-1 LINE
  • COUNTERPROPAGATING LIGHT WAVES
  • DARK RESONANCES
  • D2 LINE
  • D1 LINE
  • DIODE-LASERS
  • SATURATION SPECTROSCOPY
  • POLARIZATION
  • RB-87

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