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23 February 2018 Pulse characterization by cascading nonlinearity inside a spectrometer (CaNIS)
Ning Hsu, Luke Horstman, Jean-Claude Diels
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Proceedings Volume 10517, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications III; 105170M (2018) https://doi.org/10.1117/12.2290848
Event: SPIE LASE, 2018, San Francisco, California, United States
Abstract
A complete ultrashort pulse diagnostic requires a linear spectrum associated with a nonlinear autocorrelation or interferometric measurement. A new method is presented requiring only a grating spectrometer and two second harmonic crystals. Spectra of fundamental, second harmonic, and two cascaded spectra are used to reconstruct the spectral phase. A few proof-of-concept examples with simple phases are demonstrated using Nelder-Mead algorithm. A differential evolution genetic algorithm is introduced when the pulse has a more complicated shape or phase.
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Ning Hsu, Luke Horstman, and Jean-Claude Diels "Pulse characterization by cascading nonlinearity inside a spectrometer (CaNIS)", Proc. SPIE 10517, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications III, 105170M (23 February 2018); https://doi.org/10.1117/12.2290848
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KEYWORDS
Reconstruction algorithms
Genetic algorithms
Diffraction gratings
Phase measurement
Nonlinear crystals
Ultrafast phenomena
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