1 Nanjing Institute of Astronomical Optics & Technology, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing, Jiangsu 210042, China;
2 Key Laboratory of Astronomical Optics & Technology, Nanjing Institute of Astronomical Optics & Technology, Nanjing, Jiangsu 210042, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China
One phase retrieval method based on the Talbot effect of Ronchi grating is proposed. A CCD camera is placed at the Talbot distance of Ronchi grating to record the self-image intensity distribution of Ronchi grating. By using the stochastic parallel gradient descent (SPGD) algorithm, the coefficients of Zernike polynomials are optimized to retrieve the input phase. The numerical simulation results show that, the proposed method can quickly achieve a high-precision phase retrieval and possesses the advantages of fast convergence, high precision, and anti-noise and so on.