Large aperture optical components test based on sub-aperture stitching

Sub-aperture stitching can be used to measure large aperture optical components with low cost and high resolution by a small aperture interferometer. A program based on the improved sub-aperture stitching algorithm was compiled, and the platform for sub-aperture stitching test was established. The experimental stitching that tested a 120 mm×120 mm optical component by nine 60 mm×60 mm planar sub-apertures was performed. The peak-valley error of test was 2.37% and the root-mean-square error was only 0.27%.