1 research outputs found
Modulation induced frequency shifts in a CPT-based atomic clock
We investigate systematic errors associated with a common modulation
technique used for phase sensitive detection of a coherent population trapping
(CPT) resonance. In particular, we show that modification of the CPT resonance
lineshape due to the presence of off-resonant fields leads to frequency shifts
which may limit the stability of CPT-based atomic clocks. We also demonstrate
that an alternative demodulation technique greatly reduces these effects.Comment: 14 pages, 7 figure