Research Article
Bright High-Harmonic Generation through Coherent Synchrotron Emission Based on the Polarization Gating Scheme
Figure 5
(a) Spatiotemporal density evolution of the electrons overlaid with longitudinal current density Jx(x, t) for the polarization gating case. The overall motion of the front surface consists of longitudinal oscillations twice every laser period. (b) Electron density on a logarithmic scale and the emission of harmonic pulse. The harmonic fields are frequency-filtered by N > 10th order, showing that the harmonic pulses are emitted in the form of an attosecond pulse train. Radiation is efficiently emitted at the moments when the longitudinal momenta of the electrons reach a maximum, which is also when both transverse momenta of the plasma surface electrons reach zero simultaneously.
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