Experimental and theoretical comparison of different optical excitation schemes for a compact coherent population trapping Rb vapor clock

Z. Warren*, M. S. Shahriar, R. Tripathi, G. S. Pati

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

We have investigated, theoretically as well as experimentally, the relative merits and demerits of using three different optical configurations for a compact coherent population trapping (CPT) vapor clock using 87Rb. These correspond to the following choices of polarizations for the two Raman beams: lin ∥ lin, (σ, σ),, and push-pull optical pumping (PPOP), applied on the D1 manifold. We have used a multi-level atomic model to study the dependence of the CPT spectrum on axial as well as transverse magnetic fields for these three schemes. Corresponding experimental studies have been performed using a laboratory scale CPT clock employing a two cm long, isotopically pure rubidium cell, loaded with a buffer gas. We observed a CPT contrast close to 20% with a sub-kilohertz linewidth by adopting the PPOP scheme. We discuss the strengths and weaknesses of each of the three optical excitation schemes, and present frequency-stability measurement data for the prototype clock.

Original languageEnglish (US)
Pages (from-to)418-431
Number of pages14
JournalMetrologia
Volume54
Issue number4
DOIs
StatePublished - Jun 14 2017

Keywords

  • atomic and molecular physics
  • atomic clocks
  • atomic coherence
  • frequency standards
  • optical spectroscopy

ASJC Scopus subject areas

  • Engineering(all)

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