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Schematic layout of the experiment: A time delayed laser pulse creates a plasma (P2) that intercepts the two-color pump field. As a result, the generated THz field’s polarization is switched, which is analyzed by rotating a THz polarizer while recording the transmitted THz intensity. The fluorescence image shows the filaments of the two plasmas.
(a) Transmitted THz intensity through a THz polarizer as a function of the polarizer angle before (blue, grayscale: dark) and after (red, grayscale: light gray) the creation of interception plasma. The solid lines are fits corresponding to . (b) The THz polarization as a function of the relative time delay. The blue (grayscale: dark) and red (grayscale: light gray) squares indicate the relative time delay at which the polarizer scans in (a) are taken. The solid line is the fit based on Eq. (1) with time constant and 35° offset.
(a) The THz waveforms recorded by EO sampling as a function of the relative time delay. (b) The zoomed-in plot of (a) around time zero. (c) The THz waveforms before and after the creation of interception plasma. (d) A line-out [the dashed line in (a)] of the peak THz field as a function of the relative time delay. The solid line is a fit based on Eq. (1) with time constant . The inset shows the THz pulse energy recorded by the bolometer as a function of the relative time delay. The fit is to an exponential decay with 305 ps time constant.
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