19 February 2018 High-speed 'multi-grid' pulse-retrieval algorithm for frequency resolved optical gating
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We implemented a "multi-grid" scheme in frequency-resolved optical gating’s (FROG’s) generalized projections algorithm to boost pulse-retrieval speed for complex pulses. The multi-grid algorithm uses a set of coarser arrays, created from the original fine array, to provide an initial guess for an efficient retrieval from the much larger fine trace. Multi-grid is most needed by pulses with complex temporal profiles, which are best measured by cross-correlation FROG (XFROG) techniques. Applying multi-grid to XFROG, we reduced the retrieval time for complex pulses with TBPrms of 40 to 90 from their XFROG traces by factors of 7-10 for pulses.
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Rana Jafari and Rick Trebino "High-speed 'multi-grid' pulse-retrieval algorithm for frequency resolved optical gating", Proc. SPIE 10522, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVIII, 105221F (19 February 2018); doi: 10.1117/12.2288852; https://doi.org/10.1117/12.2288852

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