We report a gain-switched diode-seeded thulium doped fiber master oscillator power amplifier (MOPA) producing up to 295-kW picosecond pulses (35 ps) at a repetition rate of 1 MHz with a good beam quality (M2 ~1.3). A narrow-band, grating-based filter was incorporated within the amplifier chain to restrict the accumulation of nonlinear spectral broadening and counter-pumping of a short length of large-mode-area (LMA) fiber was used in the final stage amplifier to further reduce nonlinear effects. Finally, we generated wattlevel >2.5-octave supercontinuum spanning from 750 nm to 5000 nm by using the MOPA output to pump an indium fluoride fiber.
Liang, S., Xu, L., Fu, Q., Jung, Y., Shepherd, D.P., Richardson, D.J. and Alam, S.U., 2018. 295-kW peak power picosecond pulses from a thulium-doped-fiber MOPA and the generation of watt-level> 2.5-octave supercontinuum extending up to 5 μm. Optics Express, 26(6), pp.6490-6498.
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