Controlling stimulated Raman scattering by multi-color light in inertial confinement fusions

A method is put forward to control the stimulated Raman scattering in inertial confinement fusions. Using different frequency lights combined with $\mbox{3}\omega $ light can control the Raman scattering of $\mbox{3}\omega $ light. Numerical simulation results validate this method. The Raman scattering of $\mbox{3}\omega $light can be prevented to develop by using another $\mbox{2}\omega $ light, which ensures the $\mbox{3}\omega $ light depositing energy to the desired place. The Raman or Brillouin scattering of $\mbox{3}\omega $light can modify the electron density. And the inverse bremsstrahlung absorption of $\mbox{2}\omega $ light increase the electron temperature and then decrease the density in the laser path due to the pressure equilibrium. The increased inhomogenous of plasma density and electrons temperature and low density can decrease the scattering level of $\mbox{3}\omega $ light.