Frequency shift mitigation in a cold-atom CPT clock

X. Liu, Eugene Ivanov, J. Kitching, E.A. Donley

    Research output: Chapter in Book/Conference paperConference paperpeer-review

    2 Citations (Scopus)


    © 2016 IEEE.An upgrade in the laser system for our cold-atom clock based on coherent population trapping is described that makes use of an electro-optic modulator to significantly improve the phase coherence of the interrogation spectrum relative to what was achieved with our previous phase-locked loop approach. With this improvement in phase coherence, we have observed a reduction in the light shift by over two orders of magnitude. We present the impact of this improvement on the performance of the clock, for which the light shift was previously dominated by the incoherent light in the laser spectrum. We also demonstrate a new optical setup to reduce the Doppler shift.
    Original languageEnglish
    Title of host publication2016 IEEE International Frequency Control Symposium
    EditorsLute Maleki OEwaves
    PublisherIEEE, Institute of Electrical and Electronics Engineers
    ISBN (Electronic)9781509020911
    ISBN (Print)9781509020911
    Publication statusPublished - 16 Aug 2016
    Event70th IEEE International Frequency Control Symposium - New Orleans, United States
    Duration: 9 May 201512 May 2016


    Conference70th IEEE International Frequency Control Symposium
    Abbreviated titleIFCS 2016
    Country/TerritoryUnited States
    CityNew Orleans


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