Abstract
The dynamics of nanosecond square pulses have been experimentally investigated in an all-normal-dispersion Yb-doped figure-eight passively mode-locked fiber laser under the condition of dissipative soliton resonance (DSR). Experimentally, by carefully adjusting the polarization controllers with fixed pump power, the DSR square pulses could be split into their harmonic mode-locked (HML) counterparts. Further study showed that the DSR HML nanosecond square pulses had characteristics identical to those of the single DSR square pulses, with pulse energies and widths all increasing continuously with the pump power, while their peak power remained almost constant.
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