Fig. 1. Starting 3×3 spots in iterative extrapolation method

Fig. 2. Starting 3×3 spots and their row and column numbers

Fig. 3. Searching spots around starting 3×3 array

Fig. 4. Searching spots around new 3×3 array

Fig. 5. Examples of simulation. (a) Reference spot array; (b) spot array with aberration; (c) tested wavefront; (d) reconstructed wavefront; (e) reconstruction error

Fig. 6. Dynamic range ratio between iterative extrapolation method and traditional method versus Zernike order

Fig. 7. Dynamic range of SHWS with iterative extrapolation method versus F number

Fig. 8. Dynamic range of SHWS with iterative extrapolation method versus number of subapertures

Fig. 9. Optical setup for iterative extrapolation SHWS experiment

Fig. 10. Experimental results of convex lens test. (a) Spot array produced by reference wavefront; (b) spot array produced by distorted wavefront; (c) Zernike coefficients of reconstructed wavefront; (d) reconstructed wavefront

Fig. 11. Experimental results of cylindrical lens test. (a) Spot array produced by distorted wavefront; (b) Zernike coefficients of reconstructed wavefront; (c) reconstructed wavefront