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We report on a scheme to cool and compress trapped clouds of highly magnetic52Cr atoms. This scheme combines sequences of gray molasses, which freeze thevelocity distribution, and free evolutions in the (close to) harmonic trap,which periodically exchange the spatial and velocity degrees of freedom. Takentogether, the successive gray molasses pulses cool all external degrees offreedom, which leads to an increase of the phase-space density (PSD) by afactor of about 250, allowing to reach a high final PSD of about 1.7*10^-3.These experiments are performed within an optical dipole trap, in which graymolasses work equally well as in free space. The obtained samples are then anideal starting point for the evaporation stage aiming at the quantum regime.

Cooling All External Degrees of Freedom of Optically Trapped Chromium Atoms Using Gray Molasses