Optical repumping of triplet $P$-states enhances magneto-optical trapping of ytterbium atoms

摘要

Radiative decay from the excited $^1P_1$ state to metastable $^3P_2$ and$^3P_0$ states is expected to limit attainable trapped atomic population in amagneto-optic trap of ytterbium (Yb) atoms. In experiments we have carried outwith optical repumping of $^3P_{0,2}$ states to $^3P_1$, we observe enhancementof trapped atoms yield in the excited $^1P_1$ state. The individual decay rateto each metastable state is measured and the results show an excellentagreement with the theoretical values.