Controlling polarization of terahertz radiation emitted by single-color filament with amlitude modulation of laser beam

The characteristics of terahertz radiation generated during single-color filamentation of laser pulses with 470 nm wavelength are experimentally studied. It is shown that at high frequencies, terahertz radiation propagates in the form of two local maxima, in contrast to low frequencies, where a unimodal structure with a maximum on the axis is observed. We demonstrate that by amplitude modulation of the laser beam it is possible to change the polarization of terahertz radiation without significantly distorting its direction.