Abstract
We study a possibility of laser cooling of 24Mg atoms in deep optical lattice formed by intense off-resonant laser field in a presence of cooling field resonant to narrow (3s3s) 1S0 → (3s3p)3P1 (λ = 457 nm) optical transition. For description of laser cooling with taking into account quantum recoil effects we consider two quantum models. The first one is based on direct numerical solution of quantum kinetic equation for atom density matrix and the second one is simplified model based on decomposition of atom density matrix over vibration states in the lattice wells. We search cooling field intensity and detuning for minimum cooling energy and fast laser cooling.
Highlights
Nowadays deep laser cooling of neutral atoms is routinely used for broad range of modern quantum physics researches including metrology, atom optics, and quantum degeneracy studies
We study a possibility of laser cooling of 24Mg atoms in deep optical lattice formed by intense off-resonant laser field in a presence of cooling field resonant to narrow (3s3s) 1S0 → (3s3p) 3P1 (λ = 457 nm) optical transition
The well-known techniques for laser cooling below the Doppler limit, like sub-Doppler polarization gradient cooling [1], velocity selective coherent population trapping [2, 3] or Raman cooling [4, 5] are restricted to atoms with degenerated over angular momentum energy levels or hyperfine structure
Summary
Nowadays deep laser cooling of neutral atoms is routinely used for broad range of modern quantum physics researches including metrology, atom optics, and quantum degeneracy studies. Restricting by limited number of lowest vibration states we simulate the stationary distribution over the vibration levels in the optical lattice potential, as well as the laser cooling dynamics to steady state distribution This approach is similar to method was described in [16]. The second method we consider is based on direct numerical solution of quantum equation for atom density matrix that allows to take into account the fixed number of the lowest vibration level states but density matrix of atoms entirely, which include tunneling effects and above barrier motion In this method, due to the high complicity of the problem we omit the recoil effects from the pumping field resonant to (3s3s) 1S0 → (3s3p) 3P1 optical transition that is equivalent to orthogonal orientation of wave vectors of pumping and optical lattice light waves in one dimensional model
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