Reconstruction algorithm for wavefront curvature sensor with phase grating

An algorithm is proposed to reconstruct wavefront using the whole spatial distribution of curvature signals mea-suredby curvature sensor with grating. The curvature signal’s spatial distributions of curvature deformable mirror’s response functions are used to fit the measured curvature signal, the control voltages are obtained by the least square method, and then the distorted wavefront is corrected. A 41-element curvature adaptive optic system is simulated to correct the distorted wavefront by the whole signal algorithm. The results show that the 4th to 28th order Zernike aberrations can be corrected, and Zernike aberrations with zero curvature can be reconstructed more accurately than the ones with non-zero curvature. Compared with the signal-divided algorithm, the whole signal algor