Abstract
We demonstrate that terahertz generation in a two-color laser filament can exhibit conical or Gaussian far-field distribution depending on the experimental conditions. By measuring the spatial distribution of the THz electric field in the 0-3 THz spectral range, we have shown that the conical emission is likely due to photo-induced carriers in the silicon filter used to block the remaining pump laser pulses. However, the terahertz generation can retrieve a Gaussian spatial distribution by replacing the silicon filter by a ceramic one in which the photo-excitation of charge carrier does not occur.
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