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16 February 2025
 
  » arxiv » 1609.0257

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Shaping frequency correlations of ultrafast pulse-pumped modulational instability in gas-filled hollow-core PCF
Martin A. Finger ; Nicolas Y. Joly ; Philip St.J. Russell ; Maria V. Chekhova ;
Date 1 Sep 2016
AbstractWe vary the time-frequency mode structure of ultrafast pulse-pumped modulational instability (MI) in an argon-filled hollow-core kagom’e-style PCF by adjusting the pressure, pump pulse chirp, fiber length and parametric gain. Compared to solid-core systems, the pressure dependent dispersion landscape brings increased flexibility to the tailoring of frequency correlations. The resulting mode content is characterized by measuring the multimode second-order correlation function g(2) and by directly observing frequency correlations in single-shot MI spectra. We show that, from such measurements, the shapes and weights of time-frequency Schmidt (TFS) modes can be extracted and that the number of modes directly influences the shot-to-shot pulse-energy and spectral-shape fluctuations in MI. Using this approach we are able to change the number of TFS modes from 1.3 (g(2) = 1.75) to 4 (g(2) = 1.25) using only a single fiber.
Source arXiv, 1609.0257
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