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Bulletin of the American Physical Society

Continuous loading of $\nu=0$ $^{85}$Rb$_2$ ultracold molecules in a crossed optical dipole trap from a magneto-optical trap

Henry Fernandes Passagem, Nadia Bouloufa-Maafa, Olivier Dulieu, Luís Gustavo Marcassa

Published May 30, 2018• 0 citations
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Bulletin of the American Physical Society•May 30, 2019•0 citations

Continuous Loading of Ultracold Ground-State Rb285 Molecules in a Dipole Trap Using a Single Light Beam

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We have developed an approach to continuously load ultracold ^{85}Rb_{2} vibrational ground-state molecules into a crossed optical dipole trap from a magneto-optical trap. The technique relies on a single high-power light beam with a broad spectrum superimposed onto a narrow peak at an energy of about 9400 cm^{-1}. This single laser source performs all the required steps: the short-range photoassociation creating ground-state molecules after radiative emission, the cooling of the molecular vibrational population down to the lowest vibrational level v_{X}=0, and the optical trapping of these molecules. Furthermore, we probe by depletion spectroscopy and determine that 75% of the v_{X}=0 ground-state molecules are in the three lowest rotational levels J_{X}=0, 1, 2. The lifetime of the ultracold molecules in the optical dipole trap is limited to about 70 ms by off-resonant light scattering. The proposed technique opens perspectives for the formation of new molecular species in the ultracold domain, which are not yet accessible by well-established approaches.

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Ultracold collisions of mixed atoms in optical dipole trap loaded from a dark magneto-optical trap

Yanting Zhao, Ting Gong, Zhonghao Li +4 more

Abstract We study the cold collisions of mixed atoms in an optical dipole trap (ODT), which are loaded from a dark magneto-optical trap (MOT). A comprehensive, phenomenological rate equation is presented to derive the ultracold homonuclear and heteronuclear collision rates in loading and holding procedures. Our results show that the cold atoms in the dark MOT can provide a much better stable, initial atomic sample than MOT. The dependence of the heteronuclear collision rate on the trap depth is attributed to the hyperfine-changing collision by the ODT laser with a broad linewidth. The processes of deriving the collision rate are also universal for other kinds of atoms or even molecules.

Journal of Physics B Atomic Molecular and Optical Physics•Aug 31, 2017•0 citations
Continuous loading of ν=0\nu=0ν=0 85^{85}85Rb2_22​ ultracold molecules in a crossed optical dipole trap from a magneto-optical trap
Depletion spectroscopy of ultracold νx=0\nu_x=0νx​=0 85^{85}85Rb2_22​ molecules trapped in a crossed optical dipole trap
We have developed an approach to continuously load ultracold ^{85}Rb_{2} vibrational ground-state molecules into a crossed optical dipole trap from a magneto-optical trap. The technique relies on a single high-power light beam with a broad spectrum superimposed onto a narrow peak at an energy of about 9400 cm^{-1}. This single laser source performs all the required steps: the short-range photoassociation creating ground-state molecules after radiative emission, the cooling of the molecular vibrational population down to the lowest vibrational level v_{X}=0, and the optical trapping of these molecules. Furthermore, we probe by depletion spectroscopy and determine that 75% of the v_{X}=0 ground-state molecules are in the three lowest rotational levels J_{X}=0, 1, 2. The lifetime of the ultracold molecules in the optical dipole trap is limited to about 70 ms by off-resonant light scattering. The proposed technique opens perspectives for the formation of new molecular species in the ultracold domain, which are not yet accessible by well-established approaches.
In this work, we have developed and characterized a laser-pulse-train technique to observe cold Rb2{}_{2}2​ molecules trapped in an optical dipole trap. The molecules are produced in a magneto-optical trap, and then loaded into a crossed optical dipole trap. The time evolution of the molecular population is obtained by applying a laser pulse train, which photoionizes the ground-state molecules through intermediate molecular bands. Our results show that this technique allows us to obtain a faster data acquisition rate of the time evolution of the molecule population than other techniques.
Progress towards forming ultracold 85^{85}85Rb2_22​ molecules in an optical trap
Effects of resonant coupling on the formation of ultracold 85^{85}85Rb2_22​ molecules
Abstract We study the cold collisions of mixed atoms in an optical dipole trap (ODT), which are loaded from a dark magneto-optical trap (MOT). A comprehensive, phenomenological rate equation is presented to derive the ultracold homonuclear and heteronuclear collision rates in loading and holding procedures. Our results show that the cold atoms in the dark MOT can provide a much better stable, initial atomic sample than MOT. The dependence of the heteronuclear collision rate on the trap depth is attributed to the hyperfine-changing collision by the ODT laser with a broad linewidth. The processes of deriving the collision rate are also universal for other kinds of atoms or even molecules.