Spatio-Spectral-Shaping for Pulse Compression via Sequential Filamentation

A different and highly robust scheme is described in which optimization of the pulse compression involves a distinct sequential two plasma-filament structure, and where the dynamics coincide with a blue-shifted compressible tail on-axis, and a red-shifted background. During the first filament, the spectra is broadened off-axis due to the off-axis peak intensity. The formation of the second filament coincides with a dramatic collection of blue-shifted frequencies on-axis, which form the highly compressed pulse. It is shown that this spatio-spectral-shaping is dramatic in the formation of the second plasma filament.