We present a Pr3+-doped silica-based fiber laser mode-locked by using
a linear external cavity with a vibrating mirror. Stable laser pulses
with a FWHM of less than 44 ps, peak-power greater than 9 W, and repet
ition rate up to 100 MHz are obtained. The pulse width versus cavity m
ismatch DELTAL and pump power have been investigated. With a short pie
ce of nonlinear fiber included in the external cavity, laser pulses of
45 ps have been measured.