978Â nm 1.24Â ps ultra-short plused large mode area photonic crystal fiber laser

We report on a 980 nm passively mode-locking Yb-doped large mode area photonic crystal fiber oscillator with semiconductor saturable absorber mirror (SESAM) and nonlinear polarization evolution (NPE) technique, simultaneously. The oscillator generates a maximum average output power of 497 mW with a repetition rate of 87.37 MHz. Because of the invisible filter effect of NPE mode-locked fiber laser, we achieved an ultra-short pulse width of 1.24 ps. The output spectrum of the pulse is centered at 977.7 nm with a full width half maximum (FWHM) of 1.90 nm and has a characteristic steep spectral edges of dissipative soliton. In this paper, the pulse evolution process of 980 nm mode-locking fiber laser is simulated and the experimental results are good agreement with the simulation results.