Enhancement of magneto-optical trap of Ytterbium atom via optical repumping of triplet P-states = 삼중항 P-상태의 광펌핑을 통한 이터븀 원자의 자기광포획 효율 증가

Jun Woo Cho, Han‐gyeol Lee, Sangkyung Lee +5 more

Radiative decay from the excited ${}^{1}\phantom{\rule{-0.16em}{0ex}}{P}_{1}$ state to metastable ${}^{3}\phantom{\rule{-0.16em}{0ex}}{P}_{2}$ and ${}^{3}\phantom{\rule{-0.16em}{0ex}}{P}_{0}$ states is expected to limit the attainable trapped atomic population in a magneto-optic trap of ytterbium (Yb) atoms. In experiments we have carried out with optical repumping of ${}^{3}\phantom{\rule{-0.16em}{0ex}}{P}_{0,2}$ states to ${}^{3}\phantom{\rule{-0.16em}{0ex}}{P}_{1}$, we observe an enhanced yield of trapped atoms in the excited ${}^{1}\phantom{\rule{-0.16em}{0ex}}{P}_{1}$ state. The individual decay rate to each metastable state is measured and the results show excellent agreement with the theoretical values.

Chang Yong Park, Won-Kyu Lee, Dai-Hyuk Yu +3 more

Mikhail Gurov, Elena G. Gurova, А. К. Дмитриев

真之 岡野

Akio Kawasaki, Boris Braverman, QinQin Yu +1 more

Abstract We report a two-color magneto-optical trap (MOT) for ytterbium atoms where the slowing and trapping functions are separately performed by the singlet transition light ( ) and the triplet transition light ( ), respectively. The two-color MOT is achieved by simultaneously applying laser light on both the broad-linewidth singlet transition and the narrow-linewidth triplet transition. It is highly robust against laser power imbalance even at very low magnetic field gradients, and can operate at magnetic field gradients down to 2 G cm −1 where a conventional MOT using the singlet transition is unable to trap atoms. We load and trap up to atoms directly from an atomic beam at 700 K.

Akio Kawasaki, Boris Braverman, Qinqin Yu +1 more

We report a two-color magneto-optical trap (MOT) for ytterbium atoms where the slowing and trapping functions are separately performed by the singlet transition light (6s[superscript 2] [superscript 1]S[subscript 0] → 6s6p [superscript 1]P[subscript 1]) and the triplet transition light (6s[superscript 2] [superscript 1]S[subscript 0] → 6s6p [superscript 3]P[subscript 1]), respectively. The two-color MOT is achieved by simultaneously applying laser light on both the broad-linewidth singlet transition and the narrow-linewidth triplet transition. It is highly robust against laser power imbalance even at very low magnetic field gradients, and can operate at magnetic field gradients down to 2 G cm[superscript −1] where a conventional MOT using the singlet transition is unable to trap atoms. We load and trap up to 4.0 × 10[superscript 5] atoms directly from an atomic beam at 700 K.