Dispersion relations and AC stark shifts

Zenghu Chang

Jingbiao Chen

In an optical Ramsey atomic interferometer using Ramsey separated oscillating fields method, AC Stark effect shows that an interference feature is superimposed on the AC Stark level shift dispersion line-shape. This phenomenon has never been observed before. In this report, an analytic expression of the AC Stark shift in optical Ramsey atomic interferometer has been derived, and the numerical result of this interesting feature has been analyzed. Finally, the condition to measure the Interference of AC Stark Effect has been discussed.

Thomas A. DeTemple

Junhai Zhang, Jingbiao Chen

For the two-photon ac Stark effect in Raman-Ramsey configuration, such as the Raman clock, and pulsed CPT clock configuration, an interference phenomenon of two-photon ac Stark effect is predicted. Here we report this new physical phenomenon, the interference of two-photon ac Stark effect in two-zone Raman-Ramsey interactions, which is general in any Raman-Ramsey spectroscopy. In particular, for an atomic beam Raman clock configuration, the ac Stark shift will present an interference fringe caused by the separated oscillatory-field interaction when the shift fields interact with atoms at two zones. On the center of dispersion shape of normal ac-Stark shift, an interference pattern appeared when the scale of frequency detuning is expanded.

Xing Ai

Based on the theory of decay Bloch equation, the AC Zeeman(Stark) level shifts of two level atom are calculated. The calculated results indicate that the longitudinal and transverse relaxation courses can influence the level shift of atom. Level shifts of atom display different change trend respectively with the changes of longitudinal and transverse rates. Relative intensity of two relaxation courses can influence directly the dispersion property and saturation property.

C. K. Au