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Optical Engineering • new

Wavefront-aberration measurement and systematic-error analysis of a high numerical-aperture objective
Author(s): Zhixiang Liu; Tingwen Xing; Yadong Jiang; Baobin Lv
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Paper Abstract

A two-dimensional (2-D) shearing interferometer based on an amplitude chessboard grating was designed to measure the wavefront aberration of a high numerical-aperture (NA) objective. Chessboard gratings offer better diffraction efficiencies and fewer disturbing diffraction orders than traditional cross gratings. The wavefront aberration of the tested objective was retrieved from the shearing interferogram using the Fourier transform and differential Zernike polynomial-fitting methods. Grating manufacturing errors, including the duty-cycle and pattern-deviation errors, were analyzed with the Fourier transform method. Then, according to the relation between the spherical pupil and planar detector coordinates, the influence of the distortion of the pupil coordinates was simulated. Finally, the systematic error attributable to grating alignment errors was deduced through the geometrical ray-tracing method. Experimental results indicate that the measuring repeatability (3σ) of the wavefront aberration of an objective with NA 0.4 was 3.4  mλ. The systematic-error results were consistent with previous analyses. Thus, the correct wavefront aberration can be obtained after calibration.

Paper Details

Date Published: 23 February 2018
PDF: 9 pages
Opt. Eng. 57(2) 024107 doi: 10.1117/1.OE.57.2.024107
Published in: Optical Engineering Volume 57, Issue 2
Show Author Affiliations
Zhixiang Liu, Institute of Optics and Electronics, Chinese Academy of Sciences (China)
Univ. of Electronic Science and Technology of China (China)
Univ. of Chinese Academy of Sciences (China)
Tingwen Xing, Institute of Optics and Electronics, Chinese Academy of Sciences (China)
Yadong Jiang, Univ. of Electronic Science and Technology of China (China)
Baobin Lv, Institute of Optics and Electronics, Chinese Academy of Sciences (China)
Univ. of Electronic Science and Technology of China (China)
Univ. of Chinese Academy of Sciences, Beijing (China)


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