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Radiofrequency conical emission from femtosecond filaments in air
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental setup.

Image of FIG. 2.
FIG. 2.

Calculation of the static electric field generated on the propagation axis when 40 kV voltage is applied to a small (black curve) and a large (red dashed curve) pierced circular electrode.

Image of FIG. 3.
FIG. 3.

From bottom to top: spectrum of the noise, of the measured signal and of the deconvoluted signal. The measurement is performed with antenna A at 15 m and for with an electrode A and an applied voltage of 40 kV. The deconvoluted spectrum is calculated with the antenna response function presented in dashed line. The corresponding temporal waveforms for signal and noise are presented in the inset.

Image of FIG. 4.
FIG. 4.

Amplitude of the 140 MHz frequency component detected with antenna B at 90° as a function of the applied voltage on the electrode.

Image of FIG. 5.
FIG. 5.

Normalized radiation pattern measured at frequencies 655 MHz (a), 2.5 GHz (b), 1.55 GHz (c), 2.75 GHz (d), and for a plasma length (black curve). The dashed red lines show the corresponding radiation patterns calculated using formula (4).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Radiofrequency conical emission from femtosecond filaments in air