Title: Ionization-assisted spatiotemporal localization in gas-filled capillaries
Authors: Gao, Xiaohui 
Patwardhan, Gauri  
Shim, Bonggu 
Popmintchev, Tenio 
Kapteyn, Henry C 
Murnane, Margaret M 
Gaeta, Alexander L 
Category: Original Research Article
Issue Date: 1-Jul-2018
Gao, X., Patwardhan, G., Shim, B., Popmintchev, T., Kapteyn, H. C., Murnane, M. M., & Gaeta, A. L. (2018). Ionization-assisted spatiotemporal localization in gas-filled capillaries. Optics Letters, 43(13), 3112–3115. https://doi.org/10.1364/OL.43.003112
Journal: Optics Letters 
ISSN: 0146-9592
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 Pcr 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 Pcr and thus represents a mechanism for spatiotemporal confinement without self-focusing.
Keywords: Ultrafast nonlinear optics; propagation; ionization
DOI: 10.1364/OL.43.003112
DOI: 10.34726/1121
Organisation: E387-01 - Forschungsbereich Photonik 
License: In Copyright 1.0
Publication Type: Article
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