Details
| Original language | English |
|---|---|
| Article number | 023060 |
| Journal | New journal of physics |
| Volume | 17 |
| Publication status | Published - 18 Feb 2015 |
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.
Keywords
- far infrared spectroscopy, multi-color pulses, photoionization, THz generation, ultrafast nonlinear optics
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: New journal of physics, Vol. 17, 023060, 18.02.2015.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Spectral self-action of THz emission from ionizing two-color laser pulses in gases
AU - Cabrera-Granado, Eduardo
AU - Chen, Yxing
AU - Babushkin, Ihar
AU - Bergé, Luc
AU - Skupin, Stefan
PY - 2015/2/18
Y1 - 2015/2/18
N2 - 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.
AB - 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.
KW - far infrared spectroscopy
KW - multi-color pulses
KW - photoionization
KW - THz generation
KW - ultrafast nonlinear optics
UR - http://www.scopus.com/inward/record.url?scp=84924261198&partnerID=8YFLogxK
U2 - 10.1088/1367-2630/17/2/023060
DO - 10.1088/1367-2630/17/2/023060
M3 - Article
AN - SCOPUS:84924261198
VL - 17
JO - New journal of physics
JF - New journal of physics
SN - 1367-2630
M1 - 023060
ER -