A Kennard-Stepanov relation study on redistributional laser cooling in dense gaseous ensembles

Stavros Christopoulos; Anne Saß; Peter Moroshkin; Lars Weller; Roberto Cota; Benedikt Gerwers; Katharina Knicker; Martin Weitz

doi:10.1117/12.2075940

10 March 2015 A Kennard-Stepanov relation study on redistributional laser cooling in dense gaseous ensembles

Stavros Christopoulos, Anne Saß, Peter Moroshkin, Lars Weller, Roberto Cota, Benedikt Gerwers, Katharina Knicker, Martin Weitz

Author Affiliations +

Proceedings Volume 9380, Laser Refrigeration of Solids VIII; 93800M (2015) https://doi.org/10.1117/12.2075940
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

We report on experiments investigating laser cooling of atomic gases by collisional redistribution of radiation, a technique applicable to dense mixtures of alkali metals with noble gases. Thermal deflection spectroscopy is one of the methods used to measure the temperature change of the laser-cooled gas. In this work we describe experiments focusing on a different technique for precise determination of the local temperature achieved by the cooling within the gas cell. We investigate the Kennard-Stepanov relation, a thermodynamic, Boltzmann-type scaling between the absorption and emission spectral profiles of an absorber, which applies in many liquid state dye solutions as well as in semiconductor systems. To this end, absorption and emission spectra of rubidium atoms and dimers in dense argon buffer gas environment have been recorded. We demonstrate experimentally that the Kennard-Stepanov relation between absorption and emission spectra is well fulfilled for the collisionally broadened atomic and molecular transitions of the system, which allows for the extraction of the thermodynamic temperature.

Citation Download Citation

Stavros Christopoulos, Anne Saß, Peter Moroshkin, Lars Weller, Roberto Cota, Benedikt Gerwers, Katharina Knicker, and Martin Weitz "A Kennard-Stepanov relation study on redistributional laser cooling in dense gaseous ensembles", Proc. SPIE 9380, Laser Refrigeration of Solids VIII, 93800M (10 March 2015); https://doi.org/10.1117/12.2075940

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