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Optical Engineering

New method to improve the accuracy in a sequential lateral shearing interferometer
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Paper Abstract

We present a new technique for measuring ultraprecise absolute optical surfaces. The technique combines the lateral shearing method but using a Fizeau interferometer. It achieves faster reconstructions than with a deflectometric system and without the influence of the reference surface. The system is limited by the imprecision of the linear stage and those of the estimation of the curvature of the reference surface. Regarding the guidance errors, we propose a new method to estimate pitch and roll based on data redundancy analysis. Numerical simulation results of pitch-and-roll estimations are given for realistic errors. Reconstructions using the sequential lateral shearing are also provided achieving nanometer accuracy.

Paper Details

Date Published: 1 November 2011
PDF: 8 pages
Opt. Eng. 50(11) 115601 doi: 10.1117/1.3651814
Published in: Optical Engineering Volume 50, Issue 11
Show Author Affiliations
Josep Vidal González, CELLS - ALBA Synchrotron Light Source (Spain)
Josep Nicolàs, CELLS - ALBA Synchrotron Light Source (Spain)
Juan Campos, Univ. Autònoma de Barcelona (Spain)

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