Fig. 1. Schematic diagram of multi-direction wavefront stitching principle. (a) Multi-direction wavefront detection; (b) Light spot footprint map on the high-altitude DM

Fig. 2. Simulation flowchart for high-altitude DM aberration detection

Fig. 3. The detection error of each Zernike mode of the high-altitude DM. (a) Low order part; (b) High order part

Fig. 4. The relationship between the wavefront stitching error of low order Zernike modes and the conjugate height of DM

Fig. 5. The relationship between the wavefront detection error and the conjugate height of DM

Fig. 6. Simulation result of the 2.8 km DM wavefront detection. (a) True wavefront; (b) Detection wavefront; (c) Detection error

Fig. 7. Diagram of the optical structure of the experimental part of NVST MCAO system

Fig. 8. Photo of experience system. (a) Photo of NVST MCAO system; (b) Using self-collimation Hartmann to detect deformation mirror aberration; (c) Photo of 19 fiber lasers; (d) Diagram of beacon light layout; (e) Footprint map on 313-units DM

Fig. 9. Result of the DM1 detection of NVST MCAO system. (a) Real wavefront; (b) Detection wavefront; (c) Detection difference