Ultra-broadband ptychography for dispersive samples

X-ray ptychography has emerged as a powerful imaging tool on X-ray synchrotron facilities. Implementation of ptychography on laboratory-scale X-ray sources has largely been hindered by their poor temporal coherence and low flux. Here we propose an ultra-broadband method incorporating structured illumination to enhance the robustness of ptychography to broadband sources. Different from other methods, our ultra-broadband ptychography method enables imaging of dispersive samples without prior knowledge of light spectra. A 60% bandwidth light source and a high harmonic extreme ultraviolet source were used to validate our method. Moreover, our method demonstrates precise quantitative phase imaging capabilities. The proposed method will significantly advance the implementation of ptychography on laboratory-scale broadband X-ray sources and widen its applications in biomedicine and materials science.