两种透明介质微小折射率差高精度测量的新方法

发布时间：2018-05-30 16:31

本文选题：光学测量 + 折射率差　；参考：《红外与激光工程》2017年04期

【摘要】：对现有折射率的测量技术进行分析,提出了一种测量两种透明介质间微小折射率差的新方法。首先,介绍了微小折射率差干涉测量方法的原理,并对该测量原理利用Zemax光学仿真软件进行了理论模拟论证。该实验中首先,采用热键合技术制备包含两种被测量材料的组合平板;其次,利用干涉测量仪及外光路测量样件界面区域不同入射角下的光程差;再者,利用几何光学中的折射定律,推导折射率分布与干涉光程差的关系式。最后,通过二次曲线拟合获得正入射时的光程差微小变化值、换算得到样件两种材料的折射率差值。实验测量了1 at.%Yb~(3+)::YAG晶体与YAG晶体的热键合样品的折射率差,测量值为5.41×10~(-5),测量系统精度10~(-7)量级。结果表明:该测量方法原理简单、操作简便,测量精度高。
[Abstract]:Based on the analysis of the existing refractive index measurement techniques, a new method for measuring the tiny refractive index difference between two transparent media is proposed. Firstly, the principle of micro refractive index difference interferometry is introduced, and the theory is simulated by Zemax optical simulation software. In this experiment, firstly, the composite plate containing two kinds of measured materials is prepared by thermal bonding technique. Secondly, the optical path difference of the interface area of the sample is measured by the interferometer and the external light path under different incident angles. The relation between refractive index distribution and interference optical path difference is derived by using refraction law in geometric optics. Finally, the light path difference is obtained by conic fitting, and the refractive index difference between the two materials is obtained by conversion. The refractive index difference between 1 at.%Yb~(3 w: YAG crystal and YAG crystal has been measured experimentally. The measured value is 5.41 脳 10 ~ (10) -5 ~ (-5), and the precision of the measurement system is 10 ~ (7). The results show that the method is simple in principle, simple in operation and high in accuracy.
【作者单位】：北京工业大学激光工程研究院;
【基金】：国家自然科学基金(61378023)
【分类号】：O435.1

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