  For current state-of-the-art terawatt lasers, the primary laser scattering
mechanisms in plasma include Forward Raman Scattering (FRS), excitation of
plasma waves, and the self-modulational instability (SMI). Using 2D PIC
simulations, we demonstrate the dominance of the FRS in the regime with
medium-to-low density plasma and non-relativistic laser fields. However, the
use of multi-colored lasers with frequency detuning exceeding the plasma
frequency, $\Delta \omega >\omega_{\rm pe}$, suppresses the FRS. The laser
power can then be transmitted efficiently.
