提出了采用单束平面光波照射圆孔与二元相位板组合系统产生蓝失谐空心光阱的新方案,分析了空心光阱的光强分布和相应的光学囚禁势分布与相位板相位值φ的关系,并导出了光阱的几何参量与光学系统参量间的解析关系。研究发现,通过二元相位板的相位调制作用可改善空心光阱的光强分布,产生具有更大囚禁体积和更高有效光强的空心光阱。当用功率100 W波长540 nm的倍频掺镱光纤激光照射圆孔与π相位板组合系统时,对87Rb原子的光学囚禁势可达80.2 μK,该方案不仅装置简单可行,操作方便,而且在冷原子分子物理、原子分子囚禁和生命科学领域,有着广阔的应用前景。

A new scheme to trap cold atoms (or cold molecules) by an improved blue-detuned hollow optical trap is proposed,which is formed by an optical system composed of a binary phase plate and a circular aperture illuminated by a plane light wave. The dependence of the relative intensity of the optical trap and its well depth on the phase φ of the binary phase plate is studied,and some analytical relations between the geometric parameters of the optical trap and the parameters of the optical system are derived. It is found that the binary phase plate can be used to improve the intensity profile and produce a hollow optical trap with higher effective intensity and larger trapping volume. In particular,when a 100 W frequency-doubled Ytterbium fiber laser with a wavelength of 540 nm is used to illuminate the optical system composed of the π phase plate and the circular aperture,the optical trapping potential for 87Rb is about 80.2 μK. So this scheme is not only simple and convenient in the manipulation and control of cold atoms (or cold molecules) but also has wide potential applications in the fields of cold atomic and molecular physics,atom and molecule trap,life science,and so on.