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Molecular vibrational cooling by Optical Pumping with shaped femtosecond pulses

Sofikitis, Dimitris and Weber, Sebastien and Fioretti, Andréa and Horchani, Ridha and Allegrini, Maria and Chatel, Béatrice and Comparat, Daniel and Pillet, Pierre (2009) Molecular vibrational cooling by Optical Pumping with shaped femtosecond pulses. arXiv .

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SUMMARY Some of us have recently reported in Science 321 232 (2008) vibrational cooling of translationally cold Cs_2 molecules into the lowest vibrational level v=0 of the singlet X 1Sigma_g ground electronic state. Starting from a sample of cold molecules produced in a collection of vibrational levels of the ground state, our method was based on repeated optical pumping by laser light with a spectrum broad enough to excite all populated vibrational levels but frequency-limited in such a way to eliminate transitions from v=0 level, in which molecules accumulate. In this paper this method is generalized to accumulate molecules into an arbitrary selected "target" vibrational level. It is implemented by using ultrashort pulse shaping techniques based on Liquid Crystal spatial light modulator. In particular a large fraction of the initially present molecule is transferred into a selected vibrational level such as v=1, 2 and 7. Limitations of the method as well as the possible extension to rotational cooling are also discussed.

Item Type: Article
Additional Information: Imported from arXiv
Subjects: Area02 - Scienze fisiche > FIS/03 - Fisica della materia
Divisions: Dipartimenti (from 2013) > DIPARTIMENTO DI FISICA
Depositing User: dott.ssa Sandra Faita
Date Deposited: 07 Aug 2013 13:10
Last Modified: 07 Aug 2013 13:10
URI: http://eprints.adm.unipi.it/id/eprint/1470

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