  The coupling evolutions of stimulated Raman scattering (SRS) and Raman
rescattering (re-SRS) are studied under the parameter conditions of relevance
to the gas-filled hohlraum experiments at the National Ignition Facility by a
nonenveloped fluid code for the first time. It is found that re-SRS works as a
frequency filter of backscattered light of SRS in the gas region. The low
frequency modes originated from density points higher than about 0.1nc would
stimulate re-SRS and be heavily depleted by re-SRS at the region of their
effective quarter critical density region. Due to the high collisional damping
of the rescattered light, the energy of rescattered light is deposited quickly
into the plasmas along with its propagation, which limits the re-SRS in a small
region. Large amplitude of the daughter Langmuir wave of re-SRS would stimulate
cascade Langmuir decay instabilities and induce obvious low frequency density
modulations, which can further result in the inflation of high frequency modes
generated at density points lower than the growth region of re-SRS.
