A high-power laser propagating through a plasma creates a low density
channel through which it propagates self guided, This equilibrium, how
ever, is unstable to Brillouin backscattering above a threshold power,
A nonlocal theory of stimulated Brillouin scattering (SBS) reveals th
at the growth rate is significantly reduced due to a geometrical facto
r; nonetheless, it remains an important process in laser-produced plas
mas, It is also a limiting process in a plasma loaded free electron la
ser (FEL).