Time-dependent ac-Stark shift

Uwe Thumm, Feng He, Camilo Ruíz +1 more

Takashi Nakajima

We investigate the influence of ac Stark shifts on the propagation of phase-controlled two-color lasers in a two-level medium. By solving the coupled partial differential equations for atoms and fields simultaneously, it is found that the propagation dynamics are significantly modified due to the time-dependent ac Stark shifts.

Lionel Gil, Gian Luca Lippi

Nikolai B. Delone, В. П. Крайнов

C. Degenhardt, Hardo Stoehr, Uwe Sterr +2 more

We have measured the ac Stark shift of the $4{s}^{2}\phantom{\rule{0.2em}{0ex}}^{1}S_{0}--4s4p\phantom{\rule{0.2em}{0ex}}^{3}P_{1}$ line in $^{40}\mathrm{Ca}$ for perturbing laser wavelengths between $780\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ and $1064\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ with a time domain Ramsey-Bord\'e atom interferometer. We found a zero crossing of the shift for the ${m}_{S}=0--{m}_{P}=0$ transition and $\ensuremath{\sigma}$ polarized perturbation at $800.8(22)\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. The data was analyzed by a model deriving the energy shift from known transition wavelengths and strengths. To fit our data, we adjusted the Einstein $A$ coefficients of the $4s3d\phantom{\rule{0.2em}{0ex}}^{3}D--4s4p\phantom{\rule{0.2em}{0ex}}^{3}P$ and $4s5s\phantom{\rule{0.2em}{0ex}}^{3}S--4s4p\phantom{\rule{0.2em}{0ex}}^{3}P$ fine structure multiplets. With these we can predict vanishing ac Stark shifts for the $^{1}S_{0}\phantom{\rule{0.2em}{0ex}}m=0--^{3}P_{1}\phantom{\rule{0.2em}{0ex}}m=1$ transition and ${\ensuremath{\sigma}}^{\ensuremath{-}}$ light at $983(12)\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ and at $735.5(20)\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ for the transition to the $^{3}P_{0}$ level.

Nikolai B. Delone, В. П. Крайнов