Design of SONG Shack-Hartmann optical system

In this paper, we gave an optic design of stellar oscillations network group (SONG) Shack-Hartmann (S-H). The optical system and main parameters of S-H were determined, mainly according to the demands of diffraction limited imaging quality and magnitude of the telescope; According to the optical parameters of SONG and the micro lens array, an eliminating aberration design was carried out based on two doublets; The performance of the S-H was within diffraction limit. Designing results showed that the 6th magnitude and accuracy of 0.05 could be achieved. Based on the design results, an experimental system was built. A comparative study on measuring accuracy between S-H and 4-D interferometer was carried out. The experimental results showed that the measuring accuracy of S-H is 0.008 m which could meet the requirements of Chinese SONG telescope.