In this Optics Letters article, by using mid-IR fs laser-induced filamentation in air, A. V. Mitrofanov et. al generate a multioctave high energy supercontinuum output stretching from 0.25 to 6.5 μm. By analyzing the on- and off-axis properties of the output with the three dimensional time-dependent generalized nonlinear Schrödinger equation including the photoionization rate, the authors clearly reveal complex off-axial dynamics, where photoionization plays a key role in the enhancement of scattering and a blue shift of the drive field. They also find that this blue shift can be used to easily compress high peak power laser pulses in the mid-IR. With thorough understanding of the authors’ analysis, it is expected that deeper insights will result on supercontinuum generation caused by fs laser-induced filamentation.
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