Two dimensional wavefront retrieval using lateral shearing interferometry

A new zonal two-dimensional method for wavefront retrieval from a surface under test using lateral shearing interferometry is presented. A modified Saunders method and phase shifting techniques are combined to generate a method for wavefront reconstruction. The result is a wavefront with an error be...

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Bibliographic Details
Published in:Optics communications 2018-06, Vol.416, p.100-107
Main Authors: Mancilla-Escobar, B., Malacara-Hernández, Z., Malacara-Hernández, D.
Format: Article
Language:English
Subjects:
Aberrations
Lateral shearing interferometry
Phase shifting
Wavefront reconstruction
Zonal method
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Summary:A new zonal two-dimensional method for wavefront retrieval from a surface under test using lateral shearing interferometry is presented. A modified Saunders method and phase shifting techniques are combined to generate a method for wavefront reconstruction. The result is a wavefront with an error below 0.7λ and without any global high frequency filtering. A zonal analysis over square cells along the surfaces is made, obtaining a polynomial expression for the wavefront deformations over each cell. The main advantage of this method over previously published methods is that a global filtering of high spatial frequencies is not present. Thus, a global smoothing of the wavefront deformations is avoided, allowing the detection of deformations with relatively small extensions, that is, with high spatial frequencies. Additionally, local curvature and low order aberration coefficients are obtained in each cell.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2018.02.002