Fig. 7: Measuring the filament wavelength.
From: Time-resolved X-ray imaging of the current filamentation instability in solid-density plasmas
a X-ray image of the short-pulse laser interaction with a \(\varnothing 10\,\mu\) m copper wire target. b Lineout of the filament structure measured at a penetration depth of 2.5 μm from the edge of wire target, showing a clear oscillatory structure with a distribution of different wavelengths and amplitudes (black). The lineout is smoothed via Fourier filters to aid the analysis (red). The peak-to-peak distance in the lineouts is used to extract the filament wavelength λ.
