Accuracy verification methodology for CGH used for testing ultra-large aperture mirrors
Chinese Academy of SciencesComputer-generated hologram (CGH) is a unique solution for the highly accurate testing of large-aperture aspheric mirrors, and its accuracy calibration has become one of the long-standing difficulties in this filed. Scientist in China developed an accuracy verification methodology based on an equivalent element, which transfers the aspheric wavefront reference in a comparison test.