Manufacture and testing research on a refractive-reflective meniscus primary mirror with a central obscuration is
presented. The two surfaces of the primary are both designed as spheres. Because of the index homogeneity, one of them
has to be a free-form surface relied on the distribution of homogeneity. The primary is tested with a compensator. There
is a difference between the optical paths of the primary of working status and testing status. The tolerance of
mid-frequency error of the concave surface ranged from spatial period of 1.82mm to 0.39mm is tight so that the testing
result can represent the performance of the primary. The core cut from the primary was cemented and manufactured
together with the primary. The concave surface was manufactured to be a sphere. The system error caused by
mid-frequency error of the concave sphere has reached to 10.3nm (PV). The wavefront aberration of the primary has
reached to 126nm (PV).
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