We have proposed and demonstrated the generation of high power, wide band square-wave pulse in a figure-8 Yb-doped mode-locked fiber laser. The fiber laser operates at 1083.65 nm with 3 dBbandwidth of 6.5 nm, which can emit nanosecond square pulses with a maximum average output power of 1.31 W and peak power 40 W, respectively. The bandwidth, to the best of our knowledge, is the widest output bandwidth in a square-wave pulse fiber laser operating at 1 μm band.
A 978 nm single mode passively mode-locked all-fiber laser delivering square-wave pulses was demonstrated using a figure-8 cavity and a 75 cm commercial double-clad ytterbium-doped fiber. We found the three-level system near 978 nm was able to operate efficiently under clad pumping, simultaneously oscillation around 1030 nm well inhibited. The optimized nonlinear amplifying loop mirror made the mode locking stable and performed the square-pulses shaping. To the best of our knowledge, it is the first time to report the square-wave pulse fiber laser operating at 980 nm. The spectral width of the 978 mode-locked square pulses was about 4 nm, far greater than that of the mode-locked square pulses around 1060 nm reported before, which would be helpful to deeply understand the various square-wave pulses’ natures and forming mechanisms. Compared with modulated single-mode or multimode 980 nm LDs, this kind of 980 nm square-wave sources having higher brightness, more steeper rising and falling edge and shorter pulse width, might have potential applications in pumping nanosecond ytterbium or erbium fiber lasers and amplifiers.
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