Large-aperture telescope with its high spatial resolution and high light gathering capability plays an important role in military, astronomy and other fields. The demand for large aperture imaging telescope is increasingly urgent, the aperture becomes larger and larger, and the splicing main mirror has become the development trend of large-aperture telescope which brings great challenges to the optical processing and testing. This paper proposes phase-diversity phase retrieval technology which can provide a strong basis for the online testing of the future larger diameter astronomical telescope optical system and solve the difficulties in the detection of optical systems in large-aperture telescopes. Therefore, this study has important practical significance and application value in the online testing of the large-aperture telescope optical system.
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