Key Technology Research Based On Laser Cooling Of Rour-wave Mixing And Optical Microcavities

In this paper, we research the theory of laser cooling. First of all, four-wave mixing process and the optical micro-cavities are reviewed. Then we using the density matrix research four-wave mixing process of parametric amplification and optical force of field interaction with atoms. At last, optical micro-cavities Mie scattering efficiency of refrigeration is researched. The main contents are as follows:(1) The theory of interaction of light with atoms in four-wave mixing is analyzed. In the analysis of four-wave mixing parametric amplification process come to a more simple rate-equation, analyzed interaction of light with atoms in four-wave mixing, derived the radiation-force expression of field with a atom.(2) The new expression is analyzed. By MATLAB simulation analysis, we get that probe wave absorption and dispersion curves in strong and weak pumping. Meanwhile, we analyzed of the light field and the atomic interaction with the probe wave detuning and the variation of Rabi frequency. We find the larger the frequency detuning is, the greater the force of the light field and atoms is. When the pump without detuning and Rabi frequency is 0.1, the force achieve maximum.(3)We research the scattering efficiency of an optical micro-cavity. Scattering efficiency of spherical particles of different materials is compared for analysis by MATLAB. By analyzing the extreme points, we find the resonance mode can not match extreme points of scattering efficiency curve. There are two reasons: first, some resonance mode corresponding changes in the parameter size, there is no corresponding extreme point; second, some resonance mode corresponding extreme point is very close to the parameter size, causing them to correspond to a same peak.