Investigating the effects of laser bandwidths on the onset and saturation of Laser Plasma Instabilities under IFE relevant conditions

Previous simulations [1] have shown that broadband lasers can increase Raman and TPD threshold near the quarter-critical layer. However, as temporal bandwidth modulates the laser intensity over time, the plasma wave spectrum generated by the laser will be modulated by the temporal bandwidth, leading to changes in the hot electron temperature and angular spread. Therefore, we plan to perform a systematic study of LPI near the quarter critical surface in the presence of laser bandwidth for systems above and below the TPD/SRS threshold using the particle-in-cell code OSIRIS to study the effects of the laser bandwidth on both the onset and saturation of laser plasma instabilities near the quarter critical surface. We will also present the new capabilities in OSIRIS to produce customizable laser profiles that can be used for machine learning and optimization.