Laser cooling of dense atomic gases by collisional redistribution of radiation and spectroscopy of molecular dimers in a dense buffer gas environment

Anne Saß; Ralf Forge; Stavros Christopoulos; Katharina Knicker; Peter Moroshkin; Martin Weitz

doi:10.1117/12.2035630

19 February 2014 Laser cooling of dense atomic gases by collisional redistribution of radiation and spectroscopy of molecular dimers in a dense buffer gas environment

Anne Saß, Ralf Forge, Stavros Christopoulos, Katharina Knicker, Peter Moroshkin, Martin Weitz

Author Affiliations +

Proceedings Volume 9000, Laser Refrigeration of Solids VII; 90000A (2014) https://doi.org/10.1117/12.2035630
Event: SPIE OPTO, 2014, San Francisco, California, United States

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.

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Anne Saß, Ralf Forge, Stavros Christopoulos, Katharina Knicker, Peter Moroshkin, and Martin Weitz "Laser cooling of dense atomic gases by collisional redistribution of radiation and spectroscopy of molecular dimers in a dense buffer gas environment", Proc. SPIE 9000, Laser Refrigeration of Solids VII, 90000A (19 February 2014); https://doi.org/10.1117/12.2035630

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