Abstract
Pulse bursts are generated in an Yb-doped all-normal dispersion (ANDi) passively mode-locked fiber laser with Raman scatting based on nonlinear polarization rotation (NPR). The number of pulses can be continuously adjusted from 1 to 8 by adjusting the pump power. The output power varies stepwise with linearly increasing of input power and pulse numbers in the bursts. We explain that the pulse bursts in ANDi fiber laser are formed by the clamping of pulse width and peak power. The energy evolution of the pulses burst with Raman component is experimentally realized in Yb-doped fiber laser, which is excepted to benefit energy controlling in applications such as laser material ablation and so on.
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