Collinear Laser Spectroscopy Of Ca+: Solving The Field-Shift Puzzle Of The 4s(2)S(1/2) -> 4p(2)P(1/2,3/2) Transitions

High-precision quasisimultaneous collinear/anticollinear laser spectroscopy was used to measure the 4(2)S(1/2) -> 4p(2)P(1/2) (D1) and the 4s(2)S(1/2) -> 4p(2)P(3/2) (D2) as well as the three 3d -> 4p transitions in the naturally abundant Ca+ isotopes. Thereby, accuracies of approximately 100 kHz were achieved, which enabled an accurate determination of the field-shift ratio in the D2 and D1 lines through a King-plot analysis. Our value of F-D2/F-D1 = 1.0010(23) is in excellent agreement with current theoretical predictions, while former experimental results from ion-trap measurements showed a 3 sigma to 6 sigma deviation from theory introducing the so-called Ca+ field-shift puzzle. A successful check of consistency was made by combining the measurements of the D1 and D2 lines with those of the 3d -> 4p transitions and precise literature values for the 4s -> 3d and 3d(2)D(3/2) -> 3d(2)D(5/2) transitions. Failing for the previous ion-trap measurements, the check of consistency strongly indicates that our results constitute a solution to this puzzle, supporting the results of atomic theory.