Spatio-temporal measurement of ionization-induced modal index changes in gas-filled PCF by prism-assisted side-coupling
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.
Keywords
Cite
@article{arxiv.2006.07257,
title = {Spatio-temporal measurement of ionization-induced modal index changes in gas-filled PCF by prism-assisted side-coupling},
author = {Barbara M. Trabold and Mallika I. Suresh and Johannes R. Koehler and Michael H. Frosz and Francesco Tani and Philip St. J. Russell},
journal= {arXiv preprint arXiv:2006.07257},
year = {2020}
}
Comments
8 pages, 4 figures, peer-reviewed and published