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Probing the laser wakefield in underdense plasmas by induced terahertz emission
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View: Figures


Image of FIG. 1.
FIG. 1.

The EM field as a function of , where . The solid lines represent the theoretical results, and the dots represent the simulation results for (a) initial plasma density with different laser intensities; (b) with different external magnetic fields.

Image of FIG. 2.
FIG. 2.

Panels (a)–(d) represent the simulation results at time when the laser pulse just propagates to the plasma vacuum boundary: (a) the snapshot of electron density and (b) the corresponding on-axis distribution; (c) the snapshot of ; (d) the on-axis distributions for (red solid curve) and (blue dashed curve). The amplitude of has been multiplied by the factor of 4.3 × 10 which is the theoretical amplitude ratio of and . The green curve represents the theoretical result for , which agrees well with the numerical result. Panels (e)–(f) represent the simulation results at time in the vacuum for the field (e) and the corresponding on-axis distribution (f).

Image of FIG. 3.
FIG. 3.

(a) The spectrum of in the plasma region for , (b) the spectra of in the plasma region (blue dashed curve) and in the vacuum (the red solid curve) for , (c) the spectra of in the vacuum for different laser intensities for and 2.0. Other parameters are the same with those of Fig. 2 .

Image of FIG. 4.
FIG. 4.

The snapshots for the electron density (a), electromagnetic field in the plasma region (b), and the on-axis distribution for (black dashed curve) and (red solid curve) (c) at . The on-axis distribution for in the vacuum at is plotted in (d).

Image of FIG. 5.
FIG. 5.

Spectra of the field in vacuum due to the bubble structure (solid curve) and due to the broken wave structure behind the bubble structure (dashed curve). (b)Comparison of the electron-density distribution obtained from the inverse Fourier transformation (blue curve) and directly from the simulation result (red curve).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Probing the laser wakefield in underdense plasmas by induced terahertz emission