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4 March 2019 100% robust and fast algorithm for second-harmonic-generation frequency-resolved optical gating
Rana Jafari, Travis Jones, Rick Trebino
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Proceedings Volume 10903, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications IV; 109030N (2019) https://doi.org/10.1117/12.2507511
Event: SPIE LASE, 2019, San Francisco, California, United States
Abstract
We demonstrate a novel algorithmic approach for second-harmonic-generation (SHG) frequency-resolved optical gating (FROG) that always converges and is also faster for complex pulses. It takes advantage of the Paley-Weiner Theorem for generating significantly better initial guesses. It also uses a multi-grid approach, which allows the algorithm to operate initially on smaller arrays for early iterations and only on the complete array for the final few iterations. We tested it on sets of twenty thousand noisy FROG traces and have achieved 100% convergence even for pulses with time-bandwidth products of 100.
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Rana Jafari, Travis Jones, and Rick Trebino "100% robust and fast algorithm for second-harmonic-generation frequency-resolved optical gating", Proc. SPIE 10903, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications IV, 109030N (4 March 2019); https://doi.org/10.1117/12.2507511
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KEYWORDS
Ultrafast phenomena
Phase retrieval
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