System layout of the rotational prism stitching interferometer (RPSI). QWP, quarter-wave plate; PBS, polarizing beam splitter.|@|~(^,^)~|@|(a) Principle of the sub-aperture selection using a rotational prism and a translation mirror. (b) Sub-aperture position for full-aperture surface stitching.|@|~(^,^)~|@|Photograph of the rotational prism stitching interferometer setup. QWP, quarter-wave plate; PBS, polarizing beam splitter.|@|~(^,^)~|@|System wavefront error as the image rotation angle (0°–300°). RMS, root mean square.|@|~(^,^)~|@|Formation of the sub-aperture position for sample spherical mirror testing.|@|~(^,^)~|@|Surface form testing result of the spherical mirror using (a) a commercial interferometer alone, and (b) rotational prism stitching interferometer (RPSI). rms, root mean square.

2023;34:117~123 https://doi.org/10.3807/KJOP.2023.34.3.117