Figure 4
From: Phosphorene quantum dot saturable absorbers for ultrafast fiber lasers
Mode-locking performance of the Er-doped fiber laser using a microfiber-based PQD-SA device: (a) output pulse train, with a spacing of 183.2 ns; (b) measured optical spectrum; (c) autocorrelation of the output pulses, with a deconvolved duration of 882 fs, (d) radio frequency spectra of fundamental frequency and the inset of higher cavity harmonics.
