Transient stimulated Raman scattering (SRS) of 0.3 ps 515 nm laser pulses in
B
a
W
O
4
crystal was experimentally demonstrated with efficiency up to
∼
20
%
for the Stokes component with a wavenumber of
∼
925
c
m
−
1
in a simple single-pass geometry. This anomalous high efficiency was obtained due to the laser pulse self-phase modulation resulting in spectral broadening and seeding the SRS. The applicability of seed pulse production for a high-pressure sub-picosecond
C
O
2
laser amplifier via difference frequency generation in
L
i
G
a
S
2
crystal was numerically verified.
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