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We demonstrate up to 3.8 W average power broad continuum generation in holey fibers pumped by a kilowatt peak, 10 W average power, single-mode, seeded ytterbium fiber amplifier at 1064 nm. Components of generated continua and spectral slicing indicate major contributions of Raman and Kerr nonlinearities. The proposed configuration opens the way to fully fiber integrated multiwatt white light sources. © 2002 American Institute of Physics.