beecee Posted October 12, 2018 Posted October 12, 2018 https://phys.org/news/2018-10-world-fastest-camera-trillion.html What happens when a new technology is so precise that it operates on a scale beyond our characterization capabilities? For example, the lasers used at INRS produce ultrashort pulses in the femtosecond range (10-15 s), which is far too short to visualize. Although some measurements are possible, nothing beats a clear image, says INRS professor and ultrafast imaging specialist Jinyang Liang. He and his colleagues, led by Caltech's Lihong Wang, have developed what they call T-CUP: the world's fastest camera, capable of capturing 10 trillion (1013) frames per second (Fig. 1). This new camera literally makes it possible to freeze time to see phenomena—and even light—in extremely slow motion. more at https://phys.org/news/2018-10-world-fastest-camera-trillion.html <<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> the paper: https://www.nature.com/articles/s41377-018-0044-7 Single-shot real-time femtosecond imaging of temporal focusing: Abstract While the concept of focusing usually applies to the spatial domain, it is equally applicable to the time domain. Real-time imaging of temporal focusing of single ultrashort laser pulses is of great significance in exploring the physics of the space–time duality and finding diverse applications. The drastic changes in the width and intensity of an ultrashort laser pulse during temporal focusing impose a requirement for femtosecond-level exposure to capture the instantaneous light patterns generated in this exquisite phenomenon. Thus far, established ultrafast imaging techniques either struggle to reach the desired exposure time or require repeatable measurements. We have developed single-shot 10-trillion-frame-per-second compressed ultrafast photography (T-CUP), which passively captures dynamic events with 100-fs frame intervals in a single camera exposure. The synergy between compressed sensing and the Radon transformation empowers T-CUP to significantly reduce the number of projections needed for reconstructing a high-quality three-dimensional spatiotemporal datacube. As the only currently available real-time, passive imaging modality with a femtosecond exposure time, T-CUP was used to record the first-ever movie of non-repeatable temporal focusing of a single ultrashort laser pulse in a dynamic scattering medium. T-CUP’s unprecedented ability to clearly reveal the complex evolution in the shape, intensity, and width of a temporally focused pulse in a single measurement paves the way for single-shot characterization of ultrashort pulses, experimental investigation of nonlinear light-matter interactions, and real-time wavefront engineering for deep-tissue light focusing.
John Cuthber Posted October 13, 2018 Posted October 13, 2018 A bus goes past my house at exactly 8 am every morning. If I take a picture at 08:00:00 today and 08:00:01 tomorrow then 08:00:03 the day after tomorrow, and so on, would you say I was taking a picture every second?
tinkerer Posted November 18, 2018 Posted November 18, 2018 (edited) On 10/13/2018 at 4:29 AM, John Cuthber said: A bus goes past my house at exactly 8 am every morning. If I take a picture at 08:00:00 today and 08:00:01 tomorrow then 08:00:03 the day after tomorrow, and so on, would you say I was taking a picture every second? A single step forward may take one half-way to the destination; if each successive step consumes 1/2 of the remaining travel, will the destination be reached? Edited November 18, 2018 by tinkerer
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