Abstract
The complex modulation is applied to indirectly generate a focusing flattop beam, which can modulate the amplitude and phase in the optical pupil combining with the phase retrieval theory. The simulation results show that this algorithm has good uniformity. However, the alignment errors of various components in the actual optical system have an impact on the beam uniformity, especially after the implementation of SLM (Spatial Light Modulator) error calibration, the beam uniformity still hardly meets the requirements. In this paper, the error source of the complex modulation beam shaping system is theoretically analyzed, while the Mixed Region Amplitude Freedom (MRAF) method is selected as a comparative reference in this research. It is found that the defocus aberration in the SLM illumination is the main aberration which has a special grid-facula, and the error source is proved through the actual experiment. Finally, then the correction is carried out, the complex modulation has better uniformity than MRAF.
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