光栅磁光阱中原子受力理论分析  

Theoretical Analysis of the Scattering Force of Atom in Grating Magneto-Optical Trap

作　　者：杨晓燕[1] 程俊 王密信[1] YANG Xiao-yan;CHENG Jun;WANG Mi-xin(Huazhong Institute of Electro-Optics—Wuhan National Laboratory for Optoelectronics,Wuhan 430223,China)

机构地区：[1]华中光电技术研究所—武汉光电国家研究中心,湖北武汉430223

出　　处：《光学与光电技术》2022年第6期29-35,共7页Optics & Optoelectronic Technology

摘　　要：从原子受力模型出发,研究光栅磁光阱中衍射光与磁场非正交条件下亚多普勒冷却机制,建立四束型和五束型光栅磁光阱中原子受力冷却和陷俘理论模型,分析光栅磁光阱作用下原子受到散射力与陷俘速度、回复力与形成势阱范围关系,以及光栅衍射角对原子陷俘速度和原子囚陷范围的影响。结果表明,衍射光与入射光的合力在磁场中心位置为零,构成有效势阱,光栅衍射角引起的衍射光偏振分量的变化对原子所受阻尼力、回复力和原子陷俘速度均有影响,也会最终影响到光栅磁光阱囚禁的原子数,为光栅磁光阱实现原子冷却和陷俘,以及光栅芯片设计提供了理论依据。Based on the theory of the atom force model in magneto-optical trap,the sub-Doppler cooling mechanism is researched under the condition that the diffracted light in the grating magneto-optical trap is nonorthogonal to the magnetic field,and the theoretical models of atomic force cooling and trapping in four beam and five beam grating magneto-optical trap are established.The scattering force of atom under the condition of grating magneto-optical trap is calculated,and the influence of grating diffraction angle on atomic cooling velocity and atomic trapping range is analyzed.The results show that the resultant force of the diffracted light and the incident light is zero at the center of the magnetic field,forming an effective potential well.The change of the polarization component of the diffracted light caused by the diffraction angle of the grating has an impact on the damping force,the restoring force and the atomic trapping velocity of the atom,and will ultimately affect the number of atoms trapped in the grating magneto-optical trap.The theoretical study provides a theoretical basis for the realization of atomic cooling and trapping in the grating magneto-optical trap and the design of the grating chip.

关 键 词：光栅磁光阱 光栅芯片 原子冷却与囚陷 冷原子 激光冷却 

分 类 号：O562[理学—原子与分子物理]