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Spatio-temporal measurement of ionization-induced modal index changes in gas-filled PCF by prism-assisted side-coupling

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Trabold,  Barbara M.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

Suresh,  Mallika I.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

Köhler,  Johannes R.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Frosz,  Michael H.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;
Fibre Fabrication and Glass Studio, Technology Development and Service Units, Max Planck Institute for the Science of Light, Max Planck Society;

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Tani,  Francesco
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Russell,  Philip St. J.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Trabold, B. M., Suresh, M. I., Köhler, J. R., Frosz, M. H., Tani, F., & Russell, P. S. J. (2019). Spatio-temporal measurement of ionization-induced modal index changes in gas-filled PCF by prism-assisted side-coupling. Optics Express, 27(10), 14392-14399. doi:10.1364/OE.27.014392.


Cite as: http://hdl.handle.net/21.11116/0000-0003-9DDA-7
Abstract
We report the use of prism-assisted side-coupling to investigate the spatio-temporal dynamics of photoionization in an Ar-filled hollow-core photonic crystal fiber. By launching four different LP core modes we are able to probe temporal and spatial changes in the modal refractive index on timescales from a few hundred picoseconds to several hundred microseconds after the ionization event. We experimentally analyze the underlying gas density waves and find good agreement with quantitative and qualitative hydrodynamic predictions. Moreover, we observe periodic modulations in the MHz-range lasting for a few microseconds, indicating nanometer-scale vibrations of the fiber structure, driven by gas density waves.