环状球差透镜对超高斯光束光束质量的影响

Effect of an annular spherically aberrated lens on the super-Gaussian beam quality

以桶中功率及β值为光束质量评价参数，分析了环状球差透镜的球差系数、遮拦比等参数对超高斯光束光束质量的影响。研究表明，在几何焦面和实际焦面的桶中功率曲线是不同的，选用适当参数的负球差环状透镜，可获得比无球差环状透镜更高功率／能量集中度的光束。

The power in the bucket (PIB) and β-parameter are chosen as criteria for characterizing the beam quality, and the effect of the spherical aberration coefficient and obscure ratio of an annular lens on the super-Gaussian beam quality is analyzed. It is shown that there are different PIB curves at the geometrical and real focal planes, and by a suitable choice of the parameter of negative spherically aberrated annular lens the better power/energy focusability can be achieved as compared with the annular lens without spherical aberration.