cw and tunable laser operation of Yb~(3+) in Nd:Yb:CaF_2

摘要

We report here the spectroscopy and the cw and tunable laser operation of Yb~(3+) in a CaF_2 single crystal codoped with Nd~(3+) and Yb~(3+) ions. Laser emission is obtained between 1030 and 1055 nm after pumping into the Nd~(3+) ions around 795 nm and efficient Nd~(3+) → Yb~(3+) energy transfers. The efficiency of the energy transfers is attributed to the particular Nd~(3+)-Yb~(3+) clusters formed in CaF_2 because of charge compensation.