大数值孔径物镜的波像差测量及其特殊问题

刘志祥; 邢廷文; 蒋亚东; 吕保斌

doi:10.3788/OPE.20162403.0482

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大数值孔径物镜的波像差测量及其特殊问题

现代应用光学 | 更新时间：2020-08-13

- 大数值孔径物镜的波像差测量及其特殊问题
- Measurement of wavefront aberration for high NA objective and some special problems
- 光学精密工程 2016年24卷第3期页码：482-490
- 作者机构：
  
  1. 中国科学院大学北京,中国,100049
  2. 中国科学院光电技术研究所,四川成都,610209
  3. 电子科技大学,四川成都,610054
- 作者简介：
- 基金信息：
  
  国家科技重大专项资助项目(No.2009ZX02204)()
- DOI：10.3788/OPE.20162403.0482
  中图分类号： TH744.3
- 收稿日期：2015-11-25，
  
  修回日期：2016-01-05，
  
  纸质出版日期：2016-03-25
- 稿件说明：
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刘志祥, 邢廷文, 蒋亚东等. 大数值孔径物镜的波像差测量及其特殊问题[J]. 光学精密工程, 2016,24(3): 482-490

LIU Zhi-xiang, XING Ting-wen, JIANG Ya-dong etc. Measurement of wavefront aberration for high NA objective and some special problems[J]. Editorial Office of Optics and Precision Engineering, 2016,24(3): 482-490
刘志祥, 邢廷文, 蒋亚东等. 大数值孔径物镜的波像差测量及其特殊问题[J]. 光学精密工程, 2016,24(3): 482-490 DOI： 10.3788/OPE.20162403.0482.

LIU Zhi-xiang, XING Ting-wen, JIANG Ya-dong etc. Measurement of wavefront aberration for high NA objective and some special problems[J]. Editorial Office of Optics and Precision Engineering, 2016,24(3): 482-490 DOI： 10.3788/OPE.20162403.0482.

摘要

设计了基于振幅型棋盘光栅的二维剪切干涉仪

用于测量大数值孔径(NA)物镜的波像差。研究了棋盘光栅剪切干涉仪的基本原理

分析了大数值孔径物镜波像差测量时涉及的几个特殊问题。首先

根据棋盘光栅的远场衍射函数分析了棋盘光栅的衍射效率和衍射级分布

给出了剪切干涉图数据的处理方法。接着

根据球面光瞳坐标与平面探测器坐标的投影关系

分析了光瞳坐标畸变的影响;采用几何光线追迹方法

分析了光栅方程非线性对系统误差的影响。最后

推导了物镜光瞳边缘的相对照度与数值孔径的关系。试验结果表明:采用相同光瞳坐标

NA为0.6的显微物镜的波像差测量重复性(3σ)可达到3.7 mλ。对大数值孔径物镜测量过程中涉及的特殊问题进行了探讨

结果提示:测量大数值孔径物镜的波像差时

需要考虑光瞳坐标畸变、光栅方程引入的系统误差、光瞳边缘照度衰减的影响等。

Abstract

A two-dimension shearing interferometer based on an amplitude chessboard grating was designed to measure the wavefront aberration of a high Numerical Aperture(NA) objective. The principle of Chessboard Grating Lateral Shearing Interferometer(CBGLSI) was researched

and several special problems involved in the measurement of wavefront aberration for the high NA objective were investigated. Firstly

the diffraction efficiencies and diffraction order distribution of the chessboard grating were analyzed by the far-field diffraction function

and the processing method of shearing interferogram was given. According to the projection relation between the spherical pupil coordinates and plane detector coordinates

the influence of pupil coordinates distortion was analyzed. Then

the effect of the nonlinearity of grating formula on systematic errors was analyzed by geometrical ray tracing method. Finally

the relation between the relative irradiance at the objective pupil edge and the numerical aperture was deduced. Experimental results indicate that the measuring repeatability(3σ) of wavefront aberration of a objective with the NA of 0.6 is 3.7 mλ under the same pupil coordinate. Several special problems involved in the measurement of wavefront aberration was discussed

and the results suggest that the influences of pupil coordinate distortion

systematic error due to grating formula

and the irradiance attenuation at pupil edge should be considered when the wavefront aberration of the high NA objective is measured.

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references

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