Fig. 1. Fourier transform of the mode-locked laser in time and frequency domains

Fig. 2. Typical framework of a frequency comb. (a) Output spectrum of mode-locked laser; (b) amplifier output spectrum; (c) supercontinuum spectrum

Fig. 3. Mode-locked lasers structures of “8” cavity (a) and “9” cavity (b); the cavity losses versus the nonlinear phase shifts of “8” cavity (c) and “9” cavity (d)

Fig. 4. Experiment for locking repetive frequencies using an electronically controlled polarization controller. (a) Schematic of experimental setup; (b) frequency shift of the repetition rate versus the voltage applied on the EPC

Fig. 5. Two experimental constructions of divided-pulse amplification. (a) Structure with individual pulse divider and combiner; (b) structure with PBS and FRM

Fig. 6. Supercontinuum generation based on an Er-doped fiber laser mode-locked via NALM

Fig. 7. Structure of non-collinear f-2f interferometer

Fig. 8. Structure of collinear f-2f interferometer

Fig. 9. Operational principle diagram of AOFS