Measurement method of refractive index of infrared optical materials based on fizeau interferometer

WAN Boyi; CHEN Lei; LI Sutian; LIU Yuqing; YANG Yihan; WANG An; WANG Xiang

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Measurement method of refractive index of infrared optical materials based on fizeau interferometer

Optical Sensing and Measurement | 更新时间：2026-05-20

- Measurement method of refractive index of infrared optical materials based on fizeau interferometer
- OPTICAL TECHNIQUE Vol. 52, Issue 3, Pages: 295-301(2026)
- 作者机构：
  
  南京理工大学电子工程与光电技术学院，江苏南京210094
- 作者简介：
- 基金信息：
- DOI：
  CLC： O436
- Received：26 March 2026，
  
  Revised：2026-04-21，
  
  Published：20 May 2026
- 稿件说明：
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万博艺,陈磊,李素田等.基于斐索干涉仪的红外光学材料折射率测量方法[J].光学技术,2026,52(03):295-301.

WAN Boyi,CHEN Lei,LI Sutian,et al.Measurement method of refractive index of infrared optical materials based on fizeau interferometer[J].OPTICAL TECHNIQUE,2026,52(03):295-301.
万博艺,陈磊,李素田等.基于斐索干涉仪的红外光学材料折射率测量方法[J].光学技术,2026,52(03):295-301. DOI：

WAN Boyi,CHEN Lei,LI Sutian,et al.Measurement method of refractive index of infrared optical materials based on fizeau interferometer[J].OPTICAL TECHNIQUE,2026,52(03):295-301. DOI：

摘要

为精确测量红外材料折射率，保证红外光学系统质量，研究了一种基于斐索红外干涉仪的材料折射率测量方法。将待测样品加工为带有一定楔角的楔形材料，置于斐索干涉仪测试光路中，推动并令其沿自身主截面方向平移，获取干涉条纹移动数量与样品平移距离，以此计算出待测样件的折射率。在22℃环境温度下，测量了硫化锌材料在1550nm波长处的折射率，得到其折射率为2.2719。分析了测量过程中调整误差、楔板楔角测量系统误差、测量误差等因素对测试结果的影响，结果表明本文所提测量方案的测试不确定度为9.48×10

-4

。

Abstract

To precisely measure the refractive index of infrared materials and ensure the quality of infrared optical systems

a refractive index measurement method based on a Fizeau infrared interferometer is investigated. The sample under test is fabricated into a wedged element with a specific wedge angle and placed in the test arm of the Fizeau interferometer. By translating the sample along the direction of its principal section and recording the number of fringe shifts as well as the corresponding translation distance

the refractive index of the sample can be calculated. At an ambient temperature of 22°C

the refractive index of zinc sulfide material was measured at a wavelength of 1550nm

yielding a value of 2.2719. The influences of adjustment errors during measurement

systematic errors in wedge angle measurement

and other measurement errors on the final result were analyzed. The analysis indicates that the measurement uncertainty of the proposed method is 9.48×10⁻⁴.

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references

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