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Advances in atomic, molecular, and optical physics

Formation of ultracold molecules (T≤200 μK) via photoassociation in a gas of laser-cooled atoms

Françoise Masnou-Seeuws, P. Pillet

Published Jan 1, 2001• 134 citations
Publisher
DOI
10.1016/s1049-250x(01)80055-0

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Summary form only given. Although there has been stunning progress in the production of ultracold atoms (defined loosely as atoms with T<1 mK), efforts to produce translationally ultracold molecules were unsuccessful until very recently. Conventional laser cooling of atoms relies on the existence of a cycling transition, generally not an option in molecules because of their rotational and vibrational multiplicity. Various proposals have been offered to overcome this difficulty, including ultracold molecule production by photoassociation (PA) of ultracold atoms, buffer gas cooling, and cooling by a multiple-frequency laser. The first and second of these approaches have now been demonstrated successfully. This talk will describe some of these new experimental results, focusing particularly on our work at the University of Connecticut on ultracold K/sub 2/ molecules.

Quantum Electronics and Laser Science Conference•Jan 20, 2003•0 citations

Formation and spectroscopy of ultracold Cs/sub 2/ molecules

P. Pillet

Summary form only given. In contrast to atoms, laser cooling of molecules is very difficult because of the lack of a closed two-level scheme for recycling the population. The molecular photoassociation of cold atoms opens a promising alternative for the formation of cold molecules. The photoassociative spectra are obtained by the usual trap-loss method as well as by pulsed laser photoionization of Cs/sub 2/ molecules into Cs/sub 2//sup +/ ions. Different schemes to obtain formation of cold molecules through photoassociation will be discussed.

Quantum Electronics and Laser Science Conference•Jan 20, 2003•0 citations
Summary form only given. Although there has been stunning progress in the production of ultracold atoms (defined loosely as atoms with T<1 mK), efforts to produce translationally ultracold molecules were unsuccessful until very recently. Conventional laser cooling of atoms relies on the existence of a cycling transition, generally not an option in molecules because of their rotational and vibrational multiplicity. Various proposals have been offered to overcome this difficulty, including ultracold molecule production by photoassociation (PA) of ultracold atoms, buffer gas cooling, and cooling by a multiple-frequency laser. The first and second of these approaches have now been demonstrated successfully. This talk will describe some of these new experimental results, focusing particularly on our work at the University of Connecticut on ultracold K/sub 2/ molecules.
Summary form only given. In contrast to atoms, laser cooling of molecules is very difficult because of the lack of a closed two-level scheme for recycling the population. The molecular photoassociation of cold atoms opens a promising alternative for the formation of cold molecules. The photoassociative spectra are obtained by the usual trap-loss method as well as by pulsed laser photoionization of Cs/sub 2/ molecules into Cs/sub 2//sup +/ ions. Different schemes to obtain formation of cold molecules through photoassociation will be discussed.