The light shift of a CPT resonance in a periodically modulated laser field includes a phase-dependent contribution from off-resonant spectral components beating at the hyperfine frequency, so the standard ac Stark shift formula is insufficient.
Lutwak et al., in Proceeding of Precise Time and Time Interval (PTTI) Meeting, pp
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An effective model for describing coherent population trapping resonances, which correctly takes into account the off-resonant frequency components in periodically modulated laser field
The light shift of a CPT resonance in a periodically modulated laser field includes a phase-dependent contribution from off-resonant spectral components beating at the hyperfine frequency, so the standard ac Stark shift formula is insufficient.