Fig. 1. Schematic setup of Tm-doped fiber laser

Fig. 2. (a) Spectrum and (b) pulse train of fundamental mode-locking

Fig. 3. Spectrum and pulse train of different pulse bundles in Tm-doped mode-locked fiber laser. (a) 2 pulse bundles; (b) 3 pulse bundles; (c) 4 pulse bundles; (d) 5 pulse bundles; (e) 6 pulse bundles

Fig. 4. Different order harmonic mode-locked pulse train. (a) 10th order; (b) 50th order; (c) 90th order; (d) 117th order

Fig. 5. Radio frequency spectra of (a) 50th and (b) 117th order harmonic mode-locked pulse