为了测量平顶光斑和高斯光斑的半径, 采用刀口法进行了理论分析和实验验证, 并且提出了新的迭代算法。刀口的间距与光斑半径存在正比关系, 求出了相应的比例系数。在实际测量中, 测得刀口的间距后再乘上相应的系数就可以得到光斑半径。结果表明, 将迭代法进行推广, 可用于求任意已知强度分布式的光斑半径。

In order to measure the radius of hat spots and Gaussian spots, knife-edge method was adopted for the theoretical analysis and experimental verification. A new iterative algorithm was proposed. The distance of knife-edge is in direct proportion to the radius of spot. The corresponding scale factors were calculated. It is convenient to obtain the radius of spots by multiplying a corresponding scale factor to the distance of knife-edge. The result shows this iterative algorithm is also valid for any spot whose distribution of intensity is already known.