Phase retrieval based on intensity-only spatiotemporal wavefront shaping - Luis Alberto Razo López (Institut Langevin, Paris)

We introduce a phase retrieval framework based solely on intensity measurements and intensity-only spatiotemporal modulation. Our approach leverages spatiotemporal wavefront shaping to encode phase information into temporally multiplexed intensity signals, which are subsequently decomposed in the Fourier domain. We show that the resulting temporal harmonics correspond to spiral-phase–modulated speckle components, enabling the retrieval of phase information without direct phase-sensitive detection. We derive the harmonic structure induced by a rotating angular aperture mask and demonstrate that each harmonic carries a distinct spiral phase and amplitude weighting governed by a sinc envelope. Based on this structure, we develop an optimization-based reconstruction algorithm that retrieves both the unknown diffuser phase and system scaling without prior knowledge of the optical transfer function. Experimental results confirm accurate reconstruction of diffuser surfaces and aberration correction, including refocusing through digital micromirror device (DMD)-induced distortions.

Contact: Dorian Bouchet