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The light shift, as observed in the coherent population trapping (CPT) maser, was investigated theoretically and experimentally. It was found that the light shift originates from the various sidebands that are present in the spectrum of the frequency-modulated laser used to observe the CPT phenomenon.
Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on (Volume:47 , Issue: 2 )
Date of Publication: March 2000