  Recently, the verification of stimulated Raman side-scattering (SRSS) in
different laser inertial confinement fusion ignition schemes poses an
underlying risk of SRSS on ignition. In this paper, we propose a method to use
the non-uniform polarization nature of vector light to suppress SRSS and give
an additional threshold condition determined by the parameter of vector light.
For SRSS at 90 degrees, where the scattered electromagnetic wave travels
perpendicular to the density profile, the polarization variation of the pump
will change the wave vector of scattered light, thereby reducing the growth
length and preventing the scattered electromagnetic wave from growing. This
suppressive scheme is verified through three-dimensional particle-in-cell
simulations. Our illustrative simulation results demonstrate that for linearly
polarized Gaussian light, the SRSS signal occurs in the 90-degree direction
fiercely. At the same time, for the vector light, there is few SRSS signal even
if the condition dramatically exceeds the threshold. Furthermore, we discuss
the impact of vector light on stimulated Raman and Brillouin backscattering,
and two-plasma decay.
