Fig. 1. Experimental layout.

Fig. 2. Pump power induced harmonic switching with the (a)–(e) pulse trains and (f)–(j) RF spectra.

Fig. 3. Output optical spectra with different pump powers, also corresponding to different orders of HML.

Fig. 4. Pump-power-induced evolution with the single pulse envelope when the TDF laser is operated with a fundamental repetition rate.

Fig. 5. Several pulse trains with different orders of HML switched by PS manipulation with a fixed pump power of ∼4.15  W.

Fig. 6. Detailed RF characteristics with the (a) FML and (b)–(h) different orders of HML.

Fig. 7. Detailed pulse envelope of each individual h-shaped pulse with PS-fixed pump-power-related different orders of HML.

Fig. 8. Evolutions of pulse peak duration with respect to the (a) pump power with a fixed PS, and (b) HML order with a fixed pump power.

Fig. 9. Average output power versus pump power for PS-induced different orders of HML.