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Optical Engineering

Measurement for off-axis aspheric mirror using off-axis annular subaperture stitching interferometry: theory and applications
Author(s): Yongfu Wen; Haobo Cheng
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Paper Abstract

An off-axis annular subaperture stitching interferometry (OASSI) is presented to test off-axis aspheric surfaces. In view of this, the relationship between misalignment and wavefront aberration is deduced with a strict theoretical analysis. The analytic result shows that the relative misalignment errors between the interferometer and the off-axis mirror tested will lead to complex wavefront aberrations in the measurement result other than the ordinary terms of piston, tilts, and power. Based on the analytic result, a suitable off-axis stitching algorithm is developed for stitching the off-axis subaperture. Both the numerical simulations and preliminary experimental results prove the potential of the proposed approach for the measurement of off-axis aspheric surfaces. As far as we know, this is the first time that OASSI has been used to test the off-axis aspheric surface.

Paper Details

Date Published: 9 January 2015
PDF: 11 pages
Opt. Eng. 54(1) 014103 doi: 10.1117/1.OE.54.1.014103
Published in: Optical Engineering Volume 54, Issue 1
Show Author Affiliations
Yongfu Wen, Beijing Institute of Technology (China)
Ngee Ann Polytechnic (Singapore)
Haobo Cheng, Beijing Institute of Technology (China)

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