Raman-Ramsey CPT with a grating magneto-optical trap

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Abstract

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
PublisherIEEE
Pages61-64
Number of pages4
ISBN (Electronic)9781538656204
DOIs
Publication statusPublished - 12 Jul 2018
Event2018 European Frequency and Time Forum - National Museum of Automobiles, Turin, Italy
Duration: 10 Apr 201812 Apr 2018
http://www.eftf2018.it/uk/

Conference

Conference2018 European Frequency and Time Forum
Abbreviated titleEFTF 2018
CountryItaly
CityTurin
Period10/04/1812/04/18
Internet address

Keywords

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

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