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Proceedings Paper

Laser cooling of dense atomic gases by collisional redistribution of radiation and spectroscopy of molecular dimers in a dense buffer gas environment
Author(s): Anne Saß; Ralf Forge; Stavros Christopoulos; Katharina Knicker; Peter Moroshkin; Martin Weitz
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Paper Abstract

We study laser cooling of atomic gases by collisional redistribution of fluorescence. In a high pressure buffer gas regime, frequent collisions perturb the energy levels of the alkali atoms; which enables the absorption of a far red detuned irradiated laser beam. Subsequent spontaneous decay occurs close to the unperturbed resonance frequency, leading to a cooling of the dense gas mixture by redistribution of fluorescence. Thermal defection spectroscopy indicates large relative temperature changes down to and even below room temperature starting from an initial cell temperature near 700K. We are currently performing a detailed analysis of the temperature distribution in the cell. As we expect this cooling technique to work also for molecular-noble gas mixtures, we also present initial spectroscopic experiments on alkali-dimers in a dense buffer gas surrounding.

Paper Details

Date Published: 19 February 2014
PDF: 8 pages
Proc. SPIE 9000, Laser Refrigeration of Solids VII, 90000A (19 February 2014); doi: 10.1117/12.2035630
Show Author Affiliations
Anne Saß, Rheinische Friedrich-Wilhelms-Univ. Bonn (Germany)
Ralf Forge, Rheinische Friedrich-Wilhelms-Univ. Bonn (Germany)
Stavros Christopoulos, Rheinische Friedrich-Wilhelms-Univ. Bonn (Germany)
Katharina Knicker, Rheinische Friedrich-Wilhelms-Univ. Bonn (Germany)
Peter Moroshkin, Rheinische Friedrich-Wilhelms-Univ. Bonn (Germany)
Martin Weitz, Rheinische Friedrich-Wilhelms-Univ. Bonn (Germany)

Published in SPIE Proceedings Vol. 9000:
Laser Refrigeration of Solids VII
Richard I. Epstein; Denis V. Seletskiy; Mansoor Sheik-Bahae, Editor(s)

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