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Laser Cooling by Radiation

Ritika Jain


Doppler cooling of dilute atomic gases is an extremely successful application of this concept,and more recently anti-Stokes cooling in multilevel systems has been explored, culminating in the optical refrigeration of solids. Collisional radiation is a proposed different cooling mechanism that involves atomic two-level systems, though experimental investigations in gases with moderate density have so far not reached the cooling regime. Here, we experimentally demonstrate laser cooling of an atomic gas based on collisional radiation, using rubidium atoms subject to 230 bar of argon buffer gas pressure. Future prospects of the demonstrated effect include studies of super cooling beyond the homogeneous nucleation temperature, and optical chillers.

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