Laser-based Doppler cooling is a popular method for reducing the temperature of atoms, but it is limited to dilute gases. Now, researchers in Germany have demonstrated a laser scheme for cooling a highly dense gas mixture.
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Sheik-Bahae, M., Seletskiy, D. Chilling dense atomic gases. Nature Photon 3, 680–681 (2009). https://doi.org/10.1038/nphoton.2009.225
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DOI: https://doi.org/10.1038/nphoton.2009.225