Fig. 1. Structural diagram of ytterbium-doped self-sweeping fiber laser

Fig. 2. Dynamic output spectra of self-sweeping laser with pump power of 48.8 mW. (a) Spectral sequence; (b) output spectra

Fig. 3. Pulse signal of laser at pump power of 37.5 mW. (a) Microsecond pulse dynamics; (b) detail of longitudinal beat after amplification of single pulse

Fig. 4. Output characteristics of fiber laser. (a) Output power versus pump power; (b) sweeping range versus output power; (c) average pulse repetition frequency versus output power; (d) sweeping rate versus output power

Fig. 5. OSNRs of output spectra under different pump powers. (a) 86.3 mW; (b) 161.3 mW

Fig. 6. Three self-sweeping spectra realized by adjusting VOA at 52.5 mW pump power. (a1) (a2) Scanning range is 5.031 nm; (b1)(b2) scanning range is 4.618 nm; (c1)(c2) scanning range is 3.691 nm