Physical Review LettersLight Modulation at the Ground-State Hyperfine-Separation Frequency of PotassiumArthur H. Firester, Thomas R. CarverPublished Oct 31, 1966• 9 citationsPublisherAbstractReceived 13 September 1966DOI:https://doi.org/10.1103/PhysRevLett.17.947©1966 American Physical SocietyDOI10.1103/physrevlett.17.947