聚焦法测量梯度折射率透镜的折射率分布

本文针对梯度折射率分布的透镜(以后简称梯析透镜)与光纤在折射率分布上的不同点,对用于光纤及其预制棒测量的聚焦法的原理公式,计算测量方法等进行了重要改进,从而使聚焦法可适用于梯折透镜的测量.本文通过计算机模拟计算,对原理公式及计算方法的准确性和可靠性进行了验证,并同时给出了这一测量方法的精度,最后给出了测量实例及其比较结果.

Focusing method for measurement of refractive-index profiles in gradient-index lens

In this paper, according to the differences of the index profiles between gradient-index lens and fiber, the focusing method, which was applied successfully in the measurement of fiber and its preform, has been greatly improved on the principle formula and calculating miethod, in order that the focusing method can be suitable to the measurement of gradient lens. The reliability of the modified focusing method was tested by computer simulation and the error of measurement was given in same way. Finally the index profiles of some samples were measured and compared with the results by other method or instrument.