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Lensless imaging is a popular research field for the advantages of smallsize, wide field-of-view and low aberration in recent years. However, sometraditional lensless imaging methods suffer from slow convergence, mechanicalerrors and conjugate solution interference, which limit its further applicationand development. In this work, we proposed a lensless imaging method based onspatial light modulator (SLM) with unknown modulation curve. In our imagingsystem, we use SLM to modulate the wavefront of object, and introduce theptychographic scanning algorithm that is able to recover the complex amplitudeinformation even the SLM modulation curve is inaccurate or unknown. Inaddition, we also design a split-beam interference experiment to calibrate themodulation curve of SLM, and using the calibrated modulation function as theinitial value of the expended ptychography iterative engine (ePIE) algorithmcan improve the convergence speed. We further analyze the effect of modulationfunction, algorithm parameters and the characteristics of the coherent lightsource on the quality of reconstructed image. The simulated and realexperiments show that the proposed method is superior to traditional mechanicalscanning methods in terms of recovering speed and accuracy, with the recoveringresolution up to 14 um.

Lensless coherent diffraction imaging based on spatial light modulator with unknown modulation curve