We have measured the ac Stark shift of the 4s(2) S-1(0)-4s4p P-3(1) line in Ca-40 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 m(S)=0-m(P)=0 transition and sigma polarized 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 D-3-4s4p P-3 and 4s5s S-3-4s4p P-3 fine structure multiplets. With these we can predict vanishing ac Stark shifts for the S-1(0) m=0-P-3(1) m=1 transition and sigma(-) light at 983(12) nm and at 735.5(20) nm for the transition to the P-3(0) level.
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