一、前言在光纤维的制造过程中,折射率的控制是最重要的一个方面。另一方面,对于纤维状态的样品,由于涉及的测量对象小,折射率差也极微小,因而折射率分布的测定是一项困难而又费时间的工作。因此,本文我们报导一种使用干涉显微镜对阶跃型纤维的折射率分布进行简便而快速的测定方法。对于梯度型纤维,可用同样的方法测出其干涉图形,通过适当的近似法也可以求出折射率分布。 I. Introduction In the manufacture of optical fiber, the refractive index control is the most important aspect. On the other hand, the measurement of the refractive index profile is a difficult and time-consuming work for the sample in the fiber state due to the small measurement object involved and the very small difference in refractive index. Therefore, we report here a simple and rapid method for the determination of the refractive index profile of step fibers using an interference microscope. For gradient fibers, the same method can be used to measure the interference pattern. The refractive index profile can also be found by appropriate approximation.