Wavelength dependent ac-Stark shift of the 1S0 - 3P1 transition at 657 nm in Ca

Abstract

We have measured the ac-Stark shift of the 4s2 1S0 - 4s4p 3P1 line in 40Ca for perturbing laser wavelengths between 780 nm and 1064 nm with a time domain Ramsey-Borde atom interferometer. We found a zero crossing of the shift for the mS = 0 - mP = 0 transition and σpolarized perturbation at 800.8(22) 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 3D - 4s4p 3P and 4s5s 3S - 4s4p 3P fine structure multiplets. With these we can predict vanishing ac-Stark shifts for the 1S0 m = 0 - 3P1 m = 1 transition and σ- light at 983(12) nm and at 735.5(20) nm for the transition to the 3P0 level.

arXiv comment8 pages, 5 figures, 2 tables

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• Recoil-free spectroscopy of neutral Sr atoms in the Lamb-Dicke regime
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