  Stimulated low frequency Raman scattering (SLFRS) in single-crystal diamond
films (SCD) with a graphitized layer built-in is investigated. SLFRS process in
all studied structures has frequency shift in gigahertz range (5.1-13.2 GHz).
Coherent phonon mode excitation at a frequency of several GHz is a result of
nonlinear interaction of high-power laser wave with submicron films. SLFRS
conversion efficiency and threshold is estimated experimentally. Comparison of
the obtained results with data on SLFRS properties in synthetic opal matrixes
is made.
