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Single-shot supercontinuum spectral interferometry (SSSI) is an opticaltechnique that can measure ultrafast transients in the complex index ofrefraction. This method uses chirped supercontinuum reference/probe pulses thatneed to be pre-characterized prior to use. Conventionally, the spectral phase(or chirp) of those pulses can be determined from a series of phase or spectralmeasurements taken at various time delays with respect to a pump-inducedmodulation. Here we propose a novel method to simplify this process andcharacterize reference/probe pulses up to the third order dispersion from aminimum of 2 snapshots taken at different pump-probe delays. Alternatively,without any pre-characterization, our method can retrieve both unperturbed andperturbed reference/probe phases, including the pump-induced modulation, from 2time-delayed snapshots. From numerical simulations, we show that our retrievalalgorithm is robust and can achieve high accuracy even with 2 snapshots.Without any apparatus modification, our method can be easily applied to anyexperiment that uses SSSI.

Simplified Chirp Characterization in Single-shot Supercontinuum Spectral Interferometry