We demonstrate a stable passive Q-switched fiber laser operating at 1560 nm. To realize pulsing generation, a piece of rose gold as a saturable absorber. The self-started Q-switching operation presence from 35 mW and stable until 142 mW pump power. By increasing the pump power to maximum level, generated pulse train has a maximum repetition rate of 89.89 kHz and short pulse width of 2.64 μs with a pulse energy of 103.08 nJ. The maximum output power is 8.56 mW. The obtained pulse is stable with a signal-to-noise ratio of 69 dB at 35 mW pump level.
This paper reports a few-layer black phosphorus (BP) as a saturable absorber (SA) or phase-locker in generating modelocked pulses from a double-clad ytterbium-doped fiber laser (YDFL). We mechanically exfoliated the BP flakes from BP crystal through a scotch tape, and repeatedly press until the flakes thin and spread homogenously. Then, a piece of BP tape was inserted in the cavity between two fiber connectors end facet. Under 810 mW to 1320 mW pump power, stable mode-locked operation at 1085 nm with a repetition rate of 13.4 MHz is successfully achieved in normal dispersion regime. Before mode-locked operation disappears above maximum pump, the output power and pulse energy is about 80 mW and 6 nJ, respectively. This mode-locked laser produces peak power of 0.74 kW. Our work may validates BP SA as a phase-locker related to two-dimensional nanomaterials and pulsed generation in normal dispersion regime.
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