Two-color Ytterbium MOT in a compact dual-chamber setup

We present an experimental scheme for producing ultracold Ytterbium atoms in a compact dual-chamber setup. A dispenser-loaded two-dimensional (2D) magneto-optical trap (MOT) using permanent magnets and operating on the broad ${}^1{S}_0\to {}^1{P}_1$ singlet transition delivers over ${10}^7$ atoms per second through a differential pumping stage into a three-dimensional (3D) MOT. The two-color 3D MOT uses the broad singlet transition to accumulate $\sim \text{\hspace{0.17em}⁣}2\times {10}^7$ atoms of ${}^{174}\text{Yb}$ within $2.5\text{ s}$ and subsequently the narrow ${}^1{S}_0\to {}^3{P}_1$ intercombination line to cool the atomic cloud to below $10\mu \mathrm{K}$. We report optimized parameters for each stage of the atom collection sequence, achieving high transfer efficiency. We find that shelving into the triplet state during the broad-transition MOT almost doubles the number of trapped atoms.