102 W ALL-FIBER BROADBAND SUPERFLUORESCENT SOURCE BASED ON YTTERBIUM-DOPED DOUBLE-CLADDING FIBERS

摘要

We report high-power all-fiber superfluorescentsource based on ytterbium-doped double-claddingfibers (DCFs). This was achieved via an all-fibermaster oscillator power amplifier (MOPA)configuration which consisted of a broadbandamplified spontaneous emission (ASE) seed sourceand a stage of fiber power amplifier. A considerablesingle-pass gain up to 29.4dB was achieved in theamplification stage without self-pulsing, relaxationoscillation or longitudinal mode competition. Theemission spectrum was centered at 1043nm with thefull width half maximum (FWHM) bandwidth 20.5nm.The maximum output power yielded by the amplifierwas 102W with slope efficiency 70%. Furtherimprovements in power scaling are attainable by use ofadditional cascaded fiber amplifiers. Variousapplications of high-power superfluoresecent fibersource (SFS) are to be explored.