Figure 1
From: Plasma channel undulator excited by high-order laser modes
Schematic of the plasma channel undulator. As an example, three y-polarized Hermite-Gaussian modes, |0, 0〉, |0, 1〉, and |1, 0〉, propagate in a matched parabolic plasma channel. In both the (x, z) plane and the (y, z) plane, the profile of the total intensity oscillates with a wavelength proportional to the Rayleigh length of the pulse, and can be controlled by choosing the mode numbers. The ellipticity of the laser pulse oscillations can be controlled by the phase difference between the modes |0, 1〉 and |1, 0〉. The focusing fields of the induced plasma wakefield serve as an undulator. Electrons injected into the wakefield will experience undulator oscillations and emit bright radiation.
