3 years ago

Interferometric Autocorrelation Measurements of Supercontinuum based on Two-Photon Absorption.

Shanti Toenger, Roosa Mäkitalo, Jani Ahvenjärvi, Piotr Ryczkowski, Mikko Närhi, John M. Dudley, Goëry Genty

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, low-cost, and provides a direct measure of the second-order coherence properties, including quantitative information on the 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 that of a stationary chaotic light source.

Publisher URL: http://arxiv.org/abs/1901.02688

DOI: arXiv:1901.02688v1

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