Open AccessCombined computer-generated hologram for testing steep aspheric surfaces
Author(s) -
А. Г. Полещук,
Р. К. Насыров,
Jean-Michel Asfour
Publication year - 2009
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.005420
Subject(s) - optics , holography , wavefront , interferometry , distortion (music) , fizeau interferometer , lens (geology) , zernike polynomials , physics
A novel type of a combined (or multiplex) computer-generated hologram (CGH) and a method for interferometric testing of steep axially symmetric aspheres is presented. The method is based on a hybrid CGH containing two different diffractive structures. The presented new type of Diffractive Fizeau Null Lens (DFNL) design eliminates the transmitted wavefront distortion (TWD) of the CGH substrate and increases the accuracy of the surface test. The method was approved by testing a spherical reference mirror with an f-number of f/0.65.