Study of the laser linewidth influence on "lin ∥ lin" Coherent Population Trapping

E. Breschi*, G. Mileti, G. A. Kazakov, B. G. Matisov, Roland Lammegger, Laurentius Windholz

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review

Abstract

We investigated, theoretically and experimentally, the influence of the laser spectrum (in particular the linewidth) on the Coherent Population Trapping (CPT) resonance in 87Rb buffer gas cell. We investigated the case of linearly polarized laser fields. The experiments have been performed by using either a current-modulated Vertical Cavity Surface Emitting Laser (VCSEL) or a Phase-Locked-Laser (PLL) system. A model based on the density matrix approach has been used for the data interpretation. We found that, under experimental conditions suitable for compact clock applications, the fact that VCSELs have a broader spectrum than PLLs does not influence significantly the CPT signal amplitude. We demonstrate that a not negligible role is played by the destructive interference between different CPT excitation channels and propose further investigations to evaluate this contribution with respect to the other causes. Finally, we discuss the application of this scheme in compact atomic clocks.

Original languageEnglish
Title of host publication2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum, FCS
Pages617-622
Number of pages6
DOIs
Publication statusPublished - 2007
Event2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum, FCS - Geneva, Switzerland
Duration: 29 May 20071 Jun 2007

Conference

Conference2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum, FCS
Country/TerritorySwitzerland
CityGeneva
Period29/05/071/06/07

ASJC Scopus subject areas

  • Engineering(all)

Fields of Expertise

  • Sonstiges

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