Fig. 1. The schematic illustration of a SESAM mode-locked fiber laser with the linear cavity

Fig. 2. Influence of the mode field radius of a single-mode fiber on characteristics in both the time domain (a) and the frequency domain (b) for different linear cavity mode-locked laser pulses

Fig. 3. Influence of the mode field radius of a single-mode fiber on the pulse width and spectral width

Fig. 4. Influence of the gain fiber length on characteristics in both the time domain (a) and the frequency domain (b) of different linear cavity mode-locked laser pulses

Fig. 5. Effect of the gain fiber length on the pulse width and spectral width

Fig. 6. Influence of the FBG output reflectance on characteristics in both the time domain (a) and the frequency domain (b) of different linear cavity mode-locked laser pulses

Fig. 7. Influence of the reflectance of a FBG on the pulse width and spectral width

Fig. 8. Influence of the SESAM modulation depth on characteristics in both the time domain (a) and the frequency domain (b) of different linear cavity mode-locked laser pulses

Fig. 9. Effect of the modulation depth of a SESAM on the pulse width and spectral width

Fig. 10. Influence of the SESAM unsaturated loss on characteristics in both the time domain (a) and the frequency domain (b) of different linear cavity mode-locked laser pulses

Fig. 11. Effect of unsaturated loss of SESAM on the pulse width and spectral width

Fig. 12. Influence of SESAM saturation flux on characteristics in both the time domain (a) and the frequency domain (b) of different linear cavity mode-locked laser pulses

Fig. 13. Effects of saturation flux of SESAM on the pulse width and spectral width

Fig. 14. Structural diagram of the experimental setup

Fig. 15. Pulse train (a) and spectrum (b) of a mode-locked laser with the pump power of 40 mW

Fig. 16. Output power as a function of the input power

Fig. 17. Generation of mode-locked pulses with the pump power of 66 mW

Fig. 18. Spectra of mode-locked pulses with the pump power of 40，50，and 60 mW

Fig. 19. Mode-locked pulse measured by the autocorrelation procedure