We demonstrate rotational and vibrational cooling of cesium dimers by optical pumping techniques. We use two laser sources exciting all the populated rovibrational states, except a target state that thus behaves like a dark state where molecules pile up thanks to absorption-spontaneous emission cycles. We are able to accumulate photoassociated cold Cs2 molecules in their absolute ground state (v=0, J=0) with up to 40% efficiency. Given its simplicity, the method could be extended to other molecules and molecular beams. It also opens up general perspectives in laser cooling the external degrees of freedom of molecules.
|Autori:||I. Manai; R. Horchani; H. Lignier; P. Pillet; D. Comparat; A. Fioretti; M. Allegrini|
|Titolo:||Rovibrational Cooling of Molecules by Optical Pumping|
|Anno del prodotto:||2012|
|Digital Object Identifier (DOI):||10.1103/PhysRevLett.109.183001|
|Appare nelle tipologie:||1.1 Articolo in rivista|