https://www.nist.gov/publications/continuous-light-shift-correction-modualted-coherent-opoulation-trapping-clocks
We demonstrate a simple technique to significantly improve the long term frequency stability of atomic clocks based on coherent population trapping (CPT).
continuous lightshiftcorrectioncoherenttrapping
https://www.nist.gov/publications/general-methods-suppressing-light-shift-atomic-clocks-using-power-modulation
We show that the light shift in atomic clocks can be suppressed using time variation of the interrogation field intensity.
light shiftatomic clocksgeneralmethods