Fig. 3: Radially polarized beam followed by a narrow polarization gate.
From: Complete spatiotemporal and polarization characterization of ultrafast vector beams
a, b spatiotemporal ellipticity \(\varepsilon\), c, d spatiospectral ellipticity \(\varepsilon\), e, f spatiotemporal total intensity \(I_{{\mathrm{total}}}\), g, h x-projection of the spatially resolved spectrum \(S_x\), i, j selection of spatiotemporal polarization ellipses (\(E_x\) and \(E_y\) are the x and y projections of the electric field) for different scanning positions coloured by their time-dependent ellipticity, and k, l spatiospectral polarization azimuth \(\chi\). a, c, e, g, i, k experiment, b, d, f, h, j, l: simulation. The wavelength and the time are denoted by \(\lambda\) and \(t\), respectively. The azimuthal coordinate \(\theta\) is scanned in 90 points with a radius R = 3 mm. In the ellipticity, the colour scale varies from left-handed circular polarization (\(\varepsilon = - 1\), blue), to linear polarization (\(\varepsilon = 0\), green) and to right-handed circular polarization (\(\varepsilon = + 1\), red). The x projection of the spectrum and the total intensity are normalized to 1.
