Progress of a compact microwave clock based on atoms cooled with a diffractive optic

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An atomic clock based on a compact source of cold atoms and coherent population trapping (CPT) is an encouraging goal for future low-volume atomic frequency references. Our experiment seeks to investigate the performance of such a system by applying CPT in a high-contrast lin⊥lin polarisation scheme to our 87Rb grating magneto optical trap (GMOT) apparatus. In this paper, we report on our progress of improving short- term stability of our cold-atom CPT apparatus. Our recent measurements have shown a short-term stability of 5 x 10-11/√τ, with the ability to average down for times τ>100s.
Original languageEnglish
Title of host publicationProceedings Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II
EditorsSelim M. Shahriar, Jacob Scheuer
Place of PublicationBellingham, WA
Number of pages6
ISBN (Electronic)9781510633568
Publication statusPublished - 25 Feb 2020
EventSPIE Photonics West 2020 - Moscone Center, San Francisco, United States
Duration: 1 Feb 20206 Feb 2020

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSPIE Photonics West 2020
Country/TerritoryUnited States
CitySan Francisco
Internet address


  • coherent population trapping
  • grating magneto-optical trap
  • microwave atomic clock
  • cold-atoms
  • micro-fabricated grating chips


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