由衍射光学元件（ＤＯＥ）和折射透镜组成的衍折射光学元件，用于较大功率密度和光束半径的高斯光束的聚焦。运用ＧＳ算法，用外围的ＤＯＥ产生一个偏移的高斯光束分布，与中心的折射透镜会聚后的高斯光束相干叠加在一个很小的聚焦圆内，在聚焦圆内的光强分布不平整度小于５％。给出了一个圆域基模高斯光束的整形分布，计算误差小于３．５％。 Diffraction optics consisting of a diffractive optical element (DOE) and a refractive lens are used for the focusing of Gaussian beams of higher power density and beam radius. Using the GS algorithm, a shifted Gaussian beam is generated by the peripheral DOE and coherently superposed with the converging Gaussian beam of the central refractive lens within a small focusing circle. The unevenness of the light intensity distribution within the focusing circle is less than 5%. The shape distribution of a Gaussian beam with a circular domain is given, and the calculation error is less than 3.5%.