根据高斯光束和拉盖尔高斯光束两种光源的截面光强表达式，模拟出各自的光强分布. 利用几何光学模型分别计算了高斯光束和拉盖尔高斯光束在不同捕获目标尺寸和折射率、显微镜物镜的数值孔径以及样品池界面处到捕获目标的距离时的捕获效率，对高斯光束和以拉盖尔高斯光束为代表的空心光束的捕获能力进行了比较.结果表明，拉盖尔高斯光束相对于高斯光束其捕获能力具有很大的优势，拉盖尔高斯光束的最大反向捕获效率高于高斯光束的最大反向捕获效率，在光镊稳定平衡点附近的刚度大于高斯光束的刚度. 拉盖尔高斯光束由于其特殊的光强分布，当物镜的数值孔径足够大时球差对其影响较大.

The axial trapping effect of hollow beam such as LaguerreGaussian beam is better than that of Gaussian beam. The intensity distributions of Gaussian beam and LaguerreGaussian beam were simulated according to their crosssection intensity expression. The trapping Qfactors of Gaussian beam and LaguerreGaussian beam were calculated in the rayoptics model. The trapping efficiencies of Gaussian beam and LaguerreGaussian beam were compared with different trappped bead size and refractive index, numerical aperture of microscope objective, and the distance from the bottom of the sample cell to the trapped bead. The results show that the maxmium backward trapping Qfactor and trap stiffness of LaguerreGaussian beam are higher than those of the Gaussian beam. LaguerreGaussian beam is more sensitive to spherical aberration due to its special intensity distribution, especially when the numerical aperture of microscope objective is high.