Characteristics of spatial modulation in nonlinear propagation of broad-band lasers stacked by chirped pulses

To identify the potential risks of spatial modulation of broad-band laser beams stacked by chirped pulses on the safety of optics, this paper numerically investigated the effect of temporal modulation on the generation and growth of spatial modulation during its nonlinear propagation. When there is no additional spatial modulation and the B integral is limited in the practical working range (usually less than 2.0 rad), no spatial modulation will be generated for both normal dispersion and anomalous dispersion; while with the B integral further increasing, spatial modulation will emerge with a rapid growth. When there is additional spatial modulation for anomalous dispersion, the spatial modulation with additional temporal modulation will grow more quickly than that without additional tempo