Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster III

Q 56.56: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Towards redistribution laser cooling of molecular gases: Production of candidate molecule SrH by laser ablation. — Philipp Simon, •Lars Weller, Anne Saß, Peter Moroshkin, and Martin Weitz — Institut für Angewandte Physik, Universität Bonn, Bonn, Germany

Laser cooling by collisional redistribution of radiation is a powerful novel technique suitable for cooling of very dense and hot gases. It has been successfully applied for cooling alkali-metal vapours mixed with rare gases at high pressure. Here we report on the progress of our project aiming at the demonstration of the redistribution cooling in a molecular gas. The strontium monohydride molecule SrH possesses a strong near-infrared electronic transition XΣ - AΠ with a highly diagonal Franck-Condon structure that makes it a good candidate for laser cooling. We produce SrH by laser ablation of strontium dihydride in a pressurized rare gas atmosphere. The composition of the ablation plasma plume is analyzed by measuring its emission spectrum. The achieved concentration of SrH molecules and its dynamics following the ablation laser pulse is studied as a function of the buffer gas pressure and the laser intensity.