Physical Review A

Simultaneous magneto-optical trapping of three atomic species

M. Taglieber, A.-C. Voigt, Florian Henkel, S. Fray, Theodor W. Hänsch, Kai Dieckmann

Published Jan 24, 2006• 43 citations

Abstract

We report on the simultaneous trapping of two fermionic species, $^{6}\mathrm{Li}$ and $^{40}\mathrm{K}$, and a bosonic species, $^{87}\mathrm{Rb}$, demonstrating the first three-species magneto-optical trap (``triple MOT''). The apparatus including the atom sources and the three laser systems is described, and the single-species MOTs and the triple MOT are characterized. In triple MOT operation, typical atom numbers of $3.2\ifmmode\times\else\texttimes\fi{}{10}^{7}$ for $^{6}\mathrm{Li}$, $1.5\ifmmode\times\else\texttimes\fi{}{10}^{7}$ for $^{40}\mathrm{K}$, and $5.4\ifmmode\times\else\texttimes\fi{}{10}^{9}$ for $^{87}\mathrm{Rb}$ were achieved. Trap loss due to interspecies collisions was observed. We describe our way to optimize the triple MOT and turn it into a suitable source for the goal to achieve quantum degeneracy by evaporative and sympathetic cooling.

DOI: 10.1103/physreva.73.011402

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Physical Review A

Simultaneous magneto-optical trapping of three atomic species

M. Taglieber, A.-C. Voigt, Florian Henkel, S. Fray, Theodor W. Hänsch, Kai Dieckmann

Published Jan 24, 2006• 43 citations

Publisher

Abstract

We report on the simultaneous trapping of two fermionic species,

^{6}\mathrm{Li}

and

^{40}\mathrm{K}

, and a bosonic species,

^{87}\mathrm{Rb}

, demonstrating the first three-species magneto-optical trap (``triple MOT''). The apparatus including the atom sources and the three laser systems is described, and the single-species MOTs and the triple MOT are characterized. In triple MOT operation, typical atom numbers of

3.2\ifmmode\times\else\texttimes\fi{}{10}^{7}

for

^{6}\mathrm{Li}

1.5\ifmmode\times\else\texttimes\fi{}{10}^{7}

for

^{40}\mathrm{K}

, and

5.4\ifmmode\times\else\texttimes\fi{}{10}^{9}

for

^{87}\mathrm{Rb}

were achieved. Trap loss due to interspecies collisions was observed. We describe our way to optimize the triple MOT and turn it into a suitable source for the goal to achieve quantum degeneracy by evaporative and sympathetic cooling.

DOI: 10.1103/physreva.73.011402

Related papers

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J. Goldwin, Scott B. Papp, Brian DeMarco +1 more

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Chinese Physics LettersJun 1, 200712 citations

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Okano, Masayuki

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Mar 23, 201013 citations

A Rb–Cs dual-species magneto-optical trap

Shi-Yao Shao, Qing Li, Lihua Zhang +13 more

Abstract We describe a three-dimensional (3D) magneto-optical trap (MOT) capable of simultaneously capturing 85Rb and 133Cs atoms. Unlike conventional setups, our system utilizes two separate laser systems that are combined before entering the vacuum chamber, enabling the simultaneous trapping of two different atomic species. We trapped 85Rb and 133Cs atoms using relatively low total power: 8 mW cooling and 4 mW repump for 85Rb, and 7.5 mW cooling and 1.5 mW repump for 133Cs. The number of trapped atoms was 1.6 × 108 for 85Rb and 1.4 × 108 for 133Cs. The optical depths were 3.71 for 85Rb and 3.45 for 133Cs. The temperature of trapped atoms was ∼200 μK for 85Rb and ∼200 μK for 133Cs. Our 3D MOT setup allows full horizontal optical access to the trapped atomic ensembles without spatial interference from the trapping or repump laser beams. Our vacuum system is also quite simple, avoiding much of the complexity typically encountered in similar dual-species systems. However, the red detuning of the cooling laser used for atomic trapping in our system is relatively small, leaving room for further optimization. This system offers a versatile platform for exploring complex phenomena in ultracold atom physics, such as Rydberg molecule formation and interspecies interactions.Abstract We describe a three-dimensional (3D) magneto-optical trap (MOT) capable of simultaneously capturing 85Rb and 133Cs atoms. Unlike conventional setups, our system utilizes two separate laser systems that are combined before entering the vacuum chamber, enabling the simultaneous trapping of two different atomic species. We trapped 85Rb and 133Cs atoms using relatively low total power: 8 mW cooling and 4 mW repump for 85Rb, and 7.5 mW cooling and 1.5 mW repump for 133Cs. The number of trapped atoms was 1.6 × 108 for 85Rb and 1.4 × 108 for 133Cs. The optical depths were 3.71 for 85Rb and 3.45 for 133Cs. The temperature of trapped atoms was ∼200 μK for 85Rb and ∼200 μK for 133Cs. Our 3D MOT setup allows full horizontal optical access to the trapped atomic ensembles without spatial interference from the trapping or repump laser beams. Our vacuum system is also quite simple, avoiding much of the complexity typically encountered in similar dual-species systems. However, the red detuning of the cooling laser used for atomic trapping in our system is relatively small, leaving room for further optimization. This system offers a versatile platform for exploring complex phenomena in ultracold atom physics, such as Rydberg molecule formation and interspecies interactions.

Chinese Physics BMar 18, 20251 citation

Simultaneous magneto-optical trapping of two lithium isotopes

M.‐O. Mewes, Gabriele Ferrari, Florian Schreck +2 more

We confine $4\ifmmode\times\else\texttimes\fi{}{10}^{8}$ fermionic ${}^{6}\mathrm{Li}$ atoms simultaneously with $9\ifmmode\times\else\texttimes\fi{}{10}^{9}$ bosonic ${}^{7}\mathrm{Li}$ atoms in a magneto-optical trap based on an all-semiconductor laser system. We optimize the two-isotope sample for sympathetic evaporative cooling. This is an essential step towards the production of a quantum-degenerate gas of fermionic lithium atoms.We confine $4\ifmmode\times\else\texttimes\fi{}{10}^{8}$ fermionic ${}^{6}\mathrm{Li}$ atoms simultaneously with $9\ifmmode\times\else\texttimes\fi{}{10}^{9}$ bosonic ${}^{7}\mathrm{Li}$ atoms in a magneto-optical trap based on an all-semiconductor laser system. We optimize the two-isotope sample for sympathetic evaporative cooling. This is an essential step towards the production of a quantum-degenerate gas of fermionic lithium atoms.

arXiv:physics/9909007Physical Review ADec 8, 199987 citations

We report on the simultaneous trapping of two fermionic species,

^{6}\mathrm{Li}

and

^{40}\mathrm{K}

, and a bosonic species,

^{87}\mathrm{Rb}

3.2\ifmmode\times\else\texttimes\fi{}{10}^{7}

for

^{6}\mathrm{Li}

1.5\ifmmode\times\else\texttimes\fi{}{10}^{7}

for

^{40}\mathrm{K}

, and

5.4\ifmmode\times\else\texttimes\fi{}{10}^{9}

for

^{87}\mathrm{Rb}

We trap and cool a gas composed of

{}^{40}\mathrm{K}

and

{}^{87}\mathrm{Rb},

using a two-species magneto-optical trap (MOT). This trap represents the first step towards cooling the Bose-Fermi mixture to quantum degeneracy. Laser light for the MOT is derived from laser diodes and amplified with a single high-power semiconductor amplifier chip. The four-color laser system is described, and the single-species and two-species MOTs are characterized. Atom numbers of $1\ifmmode\times\else\texttimes\fi{}{10}^{7}$

{}^{40}\mathrm{K}

and $2\ifmmode\times\else\texttimes\fi{}{10}^{9}$

{}^{87}\mathrm{Rb}

are trapped in the two-species MOT. Observation of trap loss due to collisions between species is presented and future prospects for the experiment are discussed.

We present the simultaneous trapping and cooling of

{}^{85}

Rb,

{}^{87}

Rb and

{}^{133}

Cs in a triple-species magneto-optical trap (MOT). This demonstration is obtained using an all-fibre compact and robust laser system based on telecom 1.5

μ

m and 2

μ

m technologies. We characterise the two-body interspecies losses in the double and triple-species MOT. We calculate the two-body interspecies trap-loss coefficient for the

{}^{85}

Rb/

{}^{133}

Cs and the

{}^{87}

Rb/

{}^{133}

Cs pairs, representing a variation of less than 7 \% in atom number. No losses are observed between

{}^{85}

Rb and

{}^{87}

Rb in our experimental conditions. We find that interspecies interactions inside the triple-species MOT do not prevent trapping and cooling 10

^{8}

atoms for each species, making our system suitable for future multi-species cold-atom interferometry applications.

We have successfully implemented the first simultaneous magneto-optical trapping (MOT) of lithium (

^6

Li) and ytterbium (

^{174}

Yb) atoms, towards production of ultracold polar molecules of LiYb. For this purpose, we developed the dual atomic oven which contains both atomic species as an atom source and successfully observed the spectra of the Li and Yb atoms in the atomic beams from the dual atomic oven. We constructed the vacuum chamber including the glass cell with the windows made of zinc selenium (ZnSe) for the CO

_2

lasers, which are the useful light sources of optical trapping for evaporative and sympathetic cooling. Typical atom numbers and temperatures in the compressed MOT are 7

\times10^3

atoms, 640

\mu

K for

^6

Li, 7

\times10^4

atoms and 60

\mu

K for

^{174}

Yb, respectively.

We confine $4\ifmmode\times\else\texttimes\fi{}{10}^{8}$ fermionic

{}^{6}\mathrm{Li}

atoms simultaneously with $9\ifmmode\times\else\texttimes\fi{}{10}^{9}$ bosonic

{}^{7}\mathrm{Li}

atoms in a magneto-optical trap based on an all-semiconductor laser system. We optimize the two-isotope sample for sympathetic evaporative cooling. This is an essential step towards the production of a quantum-degenerate gas of fermionic lithium atoms.