Open AccessExperimental study on subaperture testing with iterative stitching algorithm
Author(s) -
Shanyong Chen,
Shengyi Li,
Yifan Dai,
Lingyan Ding,
Shengyue Zeng
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.004760
Subject(s) - image stitching , figuring , interferometry , optics , computer science , collimated light , algorithm , curved mirror , iterative method , aperture (computer memory) , physics , acoustics , laser
Applying the iterative stitching algorithm, we demonstrate the power of subaperture testing through experiments. Naturally the algorithm applies to flats, spherical or aspheric surfaces. We first apply it to a silicon carbide flat mirror with larger aperture than the interferometer's. The testing results help to obtain a high-precision mirror through five iterations of ion beam figuring. The second experiment is 37-subaperture testing of a large spherical mirror. Good consistence is observed between the stitching result and the full aperture test result using a Zygo interferometer. Finally we study the applicability of the algorithm to subaperture testing of a parabolic surface. The stitching result is consistent with the auto-collimation test result. Furthermore, the surface is tested with annular subapertures and also retrieved by our algorithm successfully.