  We present a 40-MHz ultrafast optical parametric amplifier (OPA), tunable
from 0.8 to 1 $\mu$m, with a relative intensity noise (RIN) matching the
shot-noise floor (-160 dB/Hz) above 2 MHz. The OPA is pumped by a 20-W
Kerr-lens mode-locked Ytterbium laser and seeded by a a supercontinuum
generated in an all-normal-dispersion (ANDi) fiber. With an average output
power >1.5 W, this compact and simple scheme is an attractive alternative to
synchronously-pumped optical parametric oscillators, especially within the
context of stimulated Raman scattering (SRS) imaging. To illustrate the latter,
we perform chemical imaging of vinegar droplets in oil by SRS microscopy.
