We propose a novel on-line beam diagnostic method based on beam splitting single-shot phase retrieval. The incident beam to be measured is diffracted into many replicas by a Dammann grating and then propagate through a weakly scattering phase plate with known structure, the exiting beams propagate along their original direction and form an array of diffraction pattern on the detector plane. By applying the intensity of diffraction patterns into an iterative algorithm and calculating between grating plane, weakly scattering plane, and the detector plane, the complex field of incident beam can be reconstructed rapidly, the feasibility of this method is verified experimentally with wavelength of 1053nm and 632.8nm.
He Xi, Liu Cheng, Zhu Jianqiang. On-line beam diagnostics based on beam splitting single-shot phase retrieval[J]. Chinese Optics Letters, 2018, 16(9): .
