Ionization-assisted spatiotemporal localization in gas-filled capillaries.

Opt Lett 2018 Jul;43(13):3112-3115

We demonstrate numerically and experimentally that intense pulses propagating in gas-filled capillaries can undergo localization in space and time due to strong plasma defocusing. This phenomenon can occur below or above the self-focusing threshold P as a result of ionization-induced refraction that excites higher-order modes. The constructive interference of higher-order modes leads to spatiotemporal localization and resurgence of the intensity. Simulations show that this confinement is more prominent at shorter wavelength pulses and for smaller capillary diameters. Experiments with ultraviolet pulses show evidence that this ionization-induced refocusing appears below P and thus represents a mechanism for spatiotemporal confinement without self-focusing.

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http://dx.doi.org/10.1364/OL.43.003112DOI Listing
July 2018
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