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We report the use of prism-assisted side-coupling to investigate thespatio-temporal dynamics of photoionization in an Ar-filled hollow-corephotonic crystal fiber. By launching four different LP core modes we are ableto probe temporal and spatial changes in the modal refractive index ontimescales from a few hundred picoseconds to several hundred microseconds afterthe ionization event. We experimentally analyze the underlying gas densitywaves and find good agreement with quantitative and qualitative hydrodynamicpredictions. Moreover, we observe periodic modulations in the MHz-range lastingfor a few microseconds, indicating nanometer-scale vibrations of the fiberstructure, driven by gas density waves.

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