Raman-Ramsey CPT with a grating magneto-optical trap

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We describe an experiment which combines cold 87Rb atoms from a grating magneto-optical trap (GMOT) with Lin-perp-Lin coherent population trapping (CPT) and pulsed Ramsey interrogation. The bichromatic fields required for Lin-perp-Lin are generated by combining light from a single external cavity diode laser (ECDL) with an electro-optic modulator (EOM) and an acousto-optic modulator (AOM). With this laser system and the GMOT, we are able to produce Raman-Ramsey fringes using either the F' = 1 or the F' = 2 excited states of the 87 Rb D1 line. As a step towards realising a frequency standard based on the GMOT, we measure the Ramsey fringe amplitude as a function of the magnetic bias field and the excited state. We observe dark state interference with F' = 1 and show that this interference is suppressed with F' = 2, as expected from prior work on CPT with 87Rb in thermal vapour cells.
Original languageEnglish
Title of host publication2018 European Frequency and Time Forum (EFTF)
Place of PublicationPiscataway, NJ
Number of pages4
ISBN (Electronic)9781538656204
Publication statusPublished - 12 Jul 2018
Event2018 European Frequency and Time Forum - National Museum of Automobiles, Turin, Italy
Duration: 10 Apr 201812 Apr 2018


Conference2018 European Frequency and Time Forum
Abbreviated titleEFTF 2018
Internet address


  • quantum technology
  • atomic clock
  • coherent population trapping
  • cold atoms
  • laser cooling


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