Deep laser cooling of rare-earth-doped nanocrystals in a radio-frequency trap

摘要

We study hybrid optical cooling of rare-earth-doped mesoscopic crystals via the anti-Stokes fluorescence and collective photon recoil effect inside them. The proposed cooling scheme, composed of a radio-frequency trap and a three-dimensional optical potential, makes it possible to cool doped nanocrystals down to an external temperature of 10(-8) K. By achieving the mechanical action values of similar to 10h, we come close to the macroscopic quantum states of a solid matter. Such deep translational cooling of nanocrystals paves the way to fundamental studies on the solid state and to applications in low-temperature chemistry and biophysics. (C) 2017 Optical Society of America