BROAD-BAND LIGHT GENERATION BY FEMTOSECOND PULSE AMPLIFICATION WITH STIMULATED RAMAN-SCATTERING IN A HIGH-POWER ERBIUM-DOPED FIBER AMPLIFIER

It is shown for the first time to our knowledge that short-pulse ampli fication in high-power erbium-doped fiber amplifiers, simultaneously a ccompanied by stimulated Raman scattering, generates a broadband optic al spectrum at high output power (270 mW). At 20 dB down from the peak the continuum extended over 329 nm, from 1427 to 1756 nm. The FWHM ba ndwidth was 125 nm, centered at 1650 nm. The coherence was measured to be 15 fringes, which corresponds to a 25-mu m coherence length. (C) 1 995 Optical Society of America.