A systematic study of the sub-Doppler cooling in a strontium magneto-optical trap is presented A detailed theoretical analysis of this system, based on a fully expanded multi-level theory, is also discussed Furthermore, density-related radiation heating dynamics are found to play a crucial role in this system with reduced sub-Doppler cooling force

A magneto-optical trap apparatus includes a vacuum vessel for encapsulating an atom to be trapped, an anti-Helmholtz coil for applying a magnetic field to an inside of the vacuum vessel, a laser device for generating a laser beam, and an irradiation device for irradiating the generated laser beam from a plurality of directions. The laser beam includes a first laser beam detuned from a first resonance frequency when the atom transits from a total angular momentum quantum number F in a ground state to a total angular momentum quantum number F'=F+1 in an excited state, and a second laser beam detuned from a second resonance frequency when the atom transits from the total angular momentum quantum number F in the ground state to a total angular momentum quantum number F'=F-1 in the excited state, among transitions from J=0 in a ground state to J'=1 in an excited state.

Sub-Doppler cooling in a strontium magneto-optical trap

Citations

Magneto-optical trap method and device