High frame rate (HFR) phase-and-amplitude contrast imaging is imperative for a better understanding of the underlying physics in dynamically evolving phenomena. Here we present, to our knowledge, the first experimental HFR ptychographic reconstructions using a novel Time-Resolved Imaging via Multiplexed Ptychography (TIMP) system. Our TIMP system is composed of a time-encoding device, which creates a train of temporally separated pulses of different phase profiles, and a novel beam-sampling single-shot ptychography microscope. HFR imaging is achieved by reconstructing the complex object from each pulse independently and time ordering the reconstructed objects based on the phase structure of the reconstructed probes.
Ultrafast pulsed lasers are integral for a variety of industrial, medical, and scientific endeavors. Fundamentally, pulsed lasers are complicated four-dimensional space-time phenomena that can be described by their complex spatiotemporal electric field profiles. Here we present the first ever single-shot, full-field, reference-free spatiotemporal pulse-beam measurement system capable of single-pulse characterization. Our technique combines single-shot spatiospectral characterization from broadband single-shot ptychography (BBSSP) with a collocated single-shot spectral phase measurement from single-shot frequency resolved optical gating (SSFROG). Together, these measurements provide the full complex spatiospectral field at the plane, which can be computationally propagated and Fourier transformed to provide the spatiotemporal profile of the pulse at any plane.
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