Fig. 1. Principle diagram of nonlinear loop mirror

Fig. 2. Simulation results of reflectivity versus phase shift. (a) Reflectivity versus phase shift for couplers with different splitting ratios; (b) relationship between reflectivity and different linear phase shifts added to cavity

Fig. 3. Structural diagram of laser system

Fig. 4. Main experimental results. (a) Laser output power versus pump power; (b) spectrogram of laser pulse and pulse waveform shown in inset; (c) laser spectrum; (d) autocorrelation curve of output pulse

Fig. 5. Noise versus frequency. (a) Phase noise and integrated phase noise (Int. PN); (b) relative intensity noise and integrated relative intensity noise (Int. RIN)