The use of a broadband, frequency shaped femtosecond laser on translationally cold cesium molecules has recently demonstrated to be a very efficient method of cooling also the vibrational degree of freedom. A sample of cold molecules, initially distributed over several vibrational levels, has thus been transfered into a single selected vibrational level of the singlet. X(1)Sigma(g) ground electronic state. Our method is based on repeated optical pumping by laser light with a spectrum broad enough to excite all populated vibrational levels but limited in its frequency bandwidth with a spatial light modulator. In such a way we are able to eliminate transitions from the selected level, in which molecules accumulate. In this paper we briefly report the main experimental results and then address, in a detailed way by computer simulations, the perspectives for a "complete" cooling of the molecules, including also the rotational degree of freedom. Since the pumping process strongly depends on the relative shape of the ground and excited potential curves, ro-vibrational cooling through different excited states is theoretically compared.
|Autori:||Sofikitis D; Fioretti A; Weber S; Viteau M; Chotia A; Horchani R; Allegrini M; Chatel B; Comparat D; Pillet P|
|Titolo:||Broadband Vibrational Cooling of Cold Cesium Molecules: Theory and Experiments RID E-9057-2011|
|Anno del prodotto:||2009|
|Digital Object Identifier (DOI):||10.1088/1674-0068/22/02/149-156|
|Appare nelle tipologie:||1.1 Articolo in rivista|