Triplet-singlet conversion by broadband optical pumping

Year: 2012

Authors: Horchani R., Lignier H., Bouloufa-Maafa N., Fioretti A., Pillet P., Comparat D.

Autors Affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, Batiment 505, 91405 Orsay, France;
Université Cergy-Pontoise, 95000 Cergy-Pontoise, France

Abstract: We demonstrate the conversion of cold Cs-2 molecules initially distributed over several vibrational levels of the lowest triplet state a(3) Sigma(+)(u) into the singlet ground state X-1 Sigma(+)(g). This conversion is realized by a broadband laser exciting the molecules to a well-chosen state from which they may decay to the singlet state through two sequential single-photon emission steps: The first photon populates levels with mixed triplet-singlet character, making possible a second spontaneous emission down to several vibrational levels of the X-1 Sigma(+)(g) states. By adding an optical scheme for vibrational cooling, a substantial fraction of molecules are transferred to the ground vibrational level of the singlet state. The efficiency of the conversion process, with and without vibrational cooling, is discussed at the end of the article. The presented conversion is general in scope and could be extended to other molecules.


Volume: 85 (3)      Pages from: 030502  to: 030502

More Information: We thank Olivier Dulieu for fruitful discussions, Myreille Aymar for providing potential curves and TDMs, and Maria Allegrini and Benjamin Le Crom for their help with the experiment. Laboratoire Aime Cotton is a member of Institut Francilien de Recherche sur les Atomes Froids (IFRAF) and of the LABEX PALM initiative. A. Fioretti has been supported by \”Triangle de la Physique\” under Contracts 2007-n.74T and 2009-035T \”GULFSTREAM.\”
DOI: 10.1103/PhysRevA.85.030502

Citations: 11
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