Absolute modal wavefront reconstruction in a rotational shearing interferometer by iterative optimization.

We propose an iterative optimization approach for wavefront reconstruction in a rotational shearing interferometer based on Zernike polynomials. Two incorrect shearing amounts are optimized simultaneously, enabling the absolute reconstruction of wavefronts with high uniformity in the root mean square (). Simulations under noisy conditions show that the reconstruction error, in terms of peak-to-valley () and , remains within the range.