Collisional Redistribution Laser Cooling of a High Pressure Atomic Gas

Abstract

We describe measurements demonstrating laser cooling of an atomic gas by means of collisional redistribution of radiation. The experiment uses rubidium atoms in the presence of several hundred bar of argon buffer gas pressure. Frequent collisions in the dense gas transiently shift a far red detuned optical field into resonance, while spontaneous emission occurs close to the unperturbed atomic transition frequency. Evidence for the cooling is obtained both via thermographic imaging and via thermographic deflection spectroscopy. The cooled gas has a density above 10${}^{21}$ atoms/cm${}^3$, yielding evidence for the laser cooling of a macroscopic ensemble of gas atoms.

published version

References in corpus (3)

• Supercooled Liquids for Pedestrians
• Laser Cooling by Collisional Redistribution of Radiation
• Spectroscopy of atomic rubidium at 500 bar buffer gas pressure: approaching the thermal equilibrium of dressed atom-light states

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