A direct brushing process of graphite nano-powder adhered on the single-mode fiber end-face with the use of an ultrathin
PVA film is demonstrated, such a graphite nano-powder adhered ultra-thin PVA film is introduced to passively
mode-lock a medium-gain Erbium-doped fiber laser (EDFL). The structural property of the graphite nano-powder is
investigated by Raman spectroscopy. Numerous structural defects induced when abrading the graphite into nano-powder
are found to broaden the 2D band Raman scattered signal and attenuate its peak intensity. The graphite nano-powders
exhibit the featureless transmittance to show the potential as being a broadband tuning saturable absorber. In addition,
the modulation depth of 0.43 is comparable with the graphene saturable absorber. The central wavelength of the
passively mode-locked medium-gain EDFL is at 1561.2 nm with the full width at half maximum (FHWM) of 1.62 nm,
and the pulsewidth is 1.58 ps. Under the limited intra-cavity power of 18 dBm, a nearly transform-limited passively
mode-locking EDFL with TBP of 0.32 is generated.
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