We have discovered a new mechanism for passive Q switching of fiber la
sers. 10-kW peak power pulses with similar to 2-ns pulse widths are re
ported from a diode-pumped ytterbium-doped fiber laser. The laser gene
rates a high-brightness Raman-dominated supercontinuum spectrum coveri
ng the complete window of transparency of silica fiber in the infrared
from 1.06 to 2.3 mu m. (C) 1997 Optical Society of America.