STUDY OF A POSSIBILITY OF DEEP LASER COOLING OF MAGNESIUM ATOMS FOR DESIGNING THE NEW-GENERATION FREQUENCY STANDARD

Read more Theoretical analysis of sub-Doppler laser cooling of ²⁴Mg atoms using 3³ P₂ → 3³ D₃ transition in the field of two counterpropagating light waves with opposite circular polarizations is presented. The standard semi-classical approach based on the Fokker-Plank equation is exploited for numerical modeling of laser cooling. The problem is solved out of limits of slow atom approximation and for arbitrary light intensity. The dependences of light force and diffusion on an atomic velocity are studied for various frequency detuning and Rabi frequency. Also, to obtain optimal parameters of laser cooling, the atomic velocity distributions are investigated for various conditions and the dependence of average atomic kinetic energy on the light field intensity and frequency detuning is calculated. In the case of strong field a multi-spike velocity distribution profile is observed. It results from various nonlinear effects accompany absorption of laser photons by atoms. In conclusion we make additional recommendations to increase atoms in metastable state 3³ P₂, what is necessary for effective laser cooling.

Keywords:
laser cooling of atoms, frequency and time standards. 
УДК 535.214

STUDY OF A POSSIBILITY OF DEEP LASER COOLING OF MAGNESIUM ATOMS FOR DESIGNING THE NEW-GENERATION FREQUENCY STANDARD