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Interferometric autocorrelation measurements of supercontinuum based on two-photon absorption

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Original languageEnglish
Pages (from-to)1320-1326
Number of pages7
JournalJournal of the Optical Society of America B: Optical Physics
Issue number5
Publication statusPublished - 2019
Publication typeA1 Journal article-refereed


We report on interferometric autocorrelation measurements of broadband supercontinuum light in the anomalous dispersion regime using two-photon absorption in a GaP photodetector. The method is simple and low-cost and provides a direct measure of second-order coherence properties, including quantitative information on coherence time and average duration of the supercontinuum pulses as well as on the presence of temporally coherent sub-structures. We report measurements in regimes where the supercontinuum is coherent and incoherent. In the former case, the interferometric measurements are similar to what is observed for mode-locked laser pulses, while in the latter case, the interferometric measurements and coherence properties are shown to have characteristics similar to those of a stationary chaotic light source.

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Field of science, Statistics Finland