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Spectral self-action of THz emission from ionizing two-color laser pulses in gases

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Cabrera Granado, Eduardo and Chen, Yxing and Babushkin, Ihar and Bergé, Luc and Skupin, Stephan (2015) Spectral self-action of THz emission from ionizing two-color laser pulses in gases. New Journal of Physics, 17 . 9 p.. ISSN 1367-2630

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Official URL: http://dx.doi.org/10.1088/1367-2630/17/2/023060



Abstract

The spectrum of terahertz (THz) emission in gases via ionizing two-color femtosecond pulses is analyzed by means of a semi-analytic model and numerical simulations in 1D, 2D and 3D geometries taking into account propagation effects of both pump and THz fields. We show that produced THz signals interact with free electron trajectories and thus significantly influence further THz generation upon propagation, i.e., make the process inherently nonlocal. This self-action contributes to the observed strong spectral broadening of the generated THz field. We show that diffraction of the generated THz radiation is the limiting factor for the co-propagating low frequency amplitudes and thus for the self-action mechanism in 2D and 3D geometries.


Item Type:Article
Uncontrolled Keywords:Ultrafast nonlinear optics, photoionization, THz generation, far infrared spectroscopy, multi-color pulses
Subjects:Sciences > Physics > Optics
ID Code:39855
Deposited On:31 Oct 2016 08:26
Last Modified:04 Nov 2016 08:24

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