Broadband Vibrational Cooling of Cold Cesium Molecules: Theory and Experiments
- Received Date: 2009-02-04
Abstract: 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 X1∑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 di?erent excited states is theoretically compared.
|Citation:||D. Sofikitis, A. Fioretti , S. Weber, M. Viteau, A. Chotia, R. Horchani, M. Allegrini, B. Chatel, D. Comparat, P. Pillet . Broadband Vibrational Cooling of Cold Cesium Molecules: Theory and Experiments[J]. Chinese Journal of Chemical Physics , 2009, 22(2): 149-156. doi: 10.1088/1674-0068/22/02/149-156|