Abstract
A tunable, frequency-narrowed neodymium-doped fiber laser is described for excitation of trapped ytterbium ions on the λ=935 nm 4f 14 5d 2D 3 2 −4f 13 5d6s ( 3D) 3[ 3 2 ] 1 2 transition. The laser continuously emits in three-level operation on the 4F 3 2 − 4I 9 2 transition of Nd 3+. The laser is pumped by dye laser radiation at λ=740 nm which is readily available in the setup of the ion trap experiment. Using a Brewster prism and an etalon as frequency-selective intracavity elements, an emission bandwidth in the range of 1 GHz and a slope efficiency of 6% with respect to the pump power incident on the launching optics are obtained. For ions in a radiofrequency trap which are optically excited on the 2S 1 2 − 2P 1 2 resonance transition in the presence of a buffer gas, flourescence enhancement and a complete suppression of population trapping in the 2F 7 2 level are observed if the fiber laser is tuned to the λ=935 nm transition. This indicates efficient depletion of the metastable 4f 145d 2D 3 2 level by the fiber laser.
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