根据几何光学理论，利用孔径场法进行了分析。
Based on geometrical optics theory, the re-radiation is analysed by using aperture field method.
介绍两种快速测量单模光纤模场半径的方法及其测量装置——可变孔径法和移动圆孔法；
Two methods and devices which are changeable aperture and movable aperture for measuring the mode-field radius of single-mode optical fibers are presented.
讨论环形孔径高斯光束的远场光斑能量分布，并给出拟合表达式。
The energy distribution of far field spot for annular aperture Gaussian beam is discussed and the fitting expression is given.
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