Advances in computational imaging over the last decade have sparked a revolution in metrologies aimed at understanding nano-material, magnetic, acoustic, and most recently—systems with non-repeatable and nonlinear dynamics. The most recent advances are being led by state-of-the-art single-shot, high-dimensional multiplexed imaging systems. In this talk, I will review progress on single-shot multiplexed coherent computational imaging and provide some perspective on how the technology is poised to usher in a new revolution in high-dimensional pulse-beam metrology. Uniquely, these new metrologies will enable optimizing the spatiotemporal profile of ultrashort pulses to reach the highest intensities. The talk will conclude with progress on a computational microscope capable of recording nonlinear dynamics with femtosecond frame-periods.
Ultrafast pulse-beams are four-dimensional, space–time phenomena that can exhibit complicated spatiotemporal coupling. Tailoring the spatiotemporal profile of an ultrafast pulse beam is necessary for a variety of applications ranging from basic science involving high-intensity light matter interactions to applied microscopy and advanced manufacturing and micromachining.
In this talk I will discuss the development of a novel single-pulse, reference-free spatiotemporal characterization technique based on two colocated synchronized measurements: (1) broadband single-shot ptychography and (2) single-shot frequency resolved optical gating. We apply the technique to measure the nonlinear propagation of an ultrafast pulse beam through a fused silica window. Our spatiotemporal characterization method represents a major contribution to the growing field of spatiotemporally engineered ultrafast laser pulse beams.
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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