Abstract

We report on a type of peak-power-clamped passive Q-switching in a thulium/holmium co-doped fiber laser, for the first time to the best of our knowledge. Nonlinear polarization rotation was used as an artificial saturable absorber to initiate the Q-switched operation. The peak-power-clamping (PPC) effect was realized by incorporating a piece of high nonlinear fiber in the fiber resonator and launching high-enough pump power. Normal Q-switching behavior could be observed with the pump power within the range of 0.9–0.95 W, where the pulse peak power monotonically rose with the pump power increasing. However, once the pump power reached a threshold-like level, i.e., ∼1 W, the delivered Q-switched pulse peak power started to be clamped at a nearly constant value of ∼0.4 W, corresponding to an intracavity total peak power of ∼2.22 W. It indicates that, besides typical dissipative soliton resonances in mode-locked fiber lasers, PPC effect can also occur in the passively Q-switched regime with appropriate pump power and cavity nonlinearity managements.

© 2018 IEEE

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