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Self-referenced spectral interferometry is a widely used technique due to the advantages of spectral interference. However, the inherent nature of its self-referencing confines its measurements predominantly to pulses nearing the Fourier-transform limit. In this study, we introduce an improved self-referenced spectral interferometry method capable of characterizing large, chirped pulses. Based on this method, we successfully characterized a pulse with a duration of 87 fs, exceedingly twice the Fourier-transform-limited pulse width and obtained a temporal profile consistent with that measured using frequency-resolved optical gating.
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