Stable noise-like pulse generation in all-PM mode-locked Tm-doped fiber laser based on NOLM

A stable noise-like (NL) mode-locked Tm-doped fiber laser (TDFL) relying on a nonlinear optical loop mirror (NOLM) was experimentally presented. Different from the previous NL mode-locked TDFL with NOLM, the entire polarization-maintaining (PM) fiber construction was utilized in our laser cavity, which makes the oscillator have a better resistance to environmental perturbations. The robust TDFL can deliver stable bound-state NL pulses with a pulse envelope tunable from ∼14.1 ns to ∼23.6 ns and maximum pulse energy of ∼40.3 nJ at a repetition rate of ∼980.6 kHz. Meanwhile, the all-PM fiber laser shows good power stability (less than ∼0.7%) and repeatability.