Fig. 4: The mid-IR pulse beam quality.

a The temporal profile of the on-axis mid-IR electric field at \(x=1700\) μm. b Spectral distribution of on-axis electric field at \(x=0\) μm (black) and \(x=1700\) μm (red and blue). c The distributions of refractive index of LCHP (black), RHCP subpulses (red), and the Stokes parameter \(V\) of drive laser (blue) at \(x=1000\) μm