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中文摘要：
折射率是晶体的基本参数,本文提出了利用透过光谱来测量晶体折射率的简易方法,此种方法具有对样品的尺寸要求低、测量范围无限制、操作简单、易获得一定光谱范围晶体折射率的优点。用吸收光谱法和自准直法测量了Nd：GGG的折射率,二者给出的折射率测量结果符合得很好,表明用晶体透射光谱来测量折射率是一种有效的简易测量方法。
英文摘要：
Refractive index is an essential parameter of crystal. This work gives a simple method to measure the refractive index of crystal with its absorption spectrum, which has the advantages such as no strict demand for the sample size, no measurement range restriction and is easy to operate and can obtain indices within a spectral range. The refractive indices of Nd： GGG were measured by the absorption spectrum method and autocollimation method. The measured refractive indices given by two methods are consistent very well, which indicates that it is a viable method to measure the refractive indices of crystal by its absorption spectrum.
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