超高斯光束经光阑球差透镜后的光束质量评价

以桶中功率(PIB)、β参数和η参数为激光光束质量评价参数,对超高斯光束经有方环光阑球差透镜后的光束质量作了详细的研究。大量数值计算和物理分析表明,超高斯光束经有方环光阑透镜后的光束质量与方环遮拦比、透镜球差和超高斯光束的阶数等因素有关。采用适当的负球差透镜,在实际焦面上可得到最大的PIB,η值和最小的β值,从而获得比无球差透镜更好的光束质量,甚至使β1。

Beam quality characterization of super-Gaussian beams passing through a spherically aberrated lens with an annular rectangular aperture

In the paper,the power in the bucket(PIB), β and η parameters are chosen as criteria to characterize the laser beam quality in the far field,then the beam quality of super Gaussian beams passing through a spherically aberrated lens with an annular rectangular aperture is studied.It is shown by a great number of numerical calculation results and physical analyses that the beam quality depends on the obscure ratio of the rectangular aperture,spherical aberration of the lens and the order of the super Gaussian beam.If a suitable lens with negative spherical coefficient is selected,a better beam quality at the real focal plane can be obtained.Namely,larger PIB and η,smaller β,even β smaller than 1.