Fig. 1. Schematic of tunable all-PM mode-locked laser with a nonlinear amplifying loop mirror

Fig. 2. NALM transmittance versus the input optical power

Fig. 3. Results of single-pulse mode-locked at 1030 nm. (a) FWHM of the output spectra is 3.859 nm; (b) autocorrelation trace; (c) pulse sequence of 4.133 MHz; (d) spectrum of fundamental frequency, and the inset is harmonic spectrum

Fig. 4. Output results when the mode-locked laser is tuned from 1022.5 nm to 1037.5 nm under Pm=76 mW and Pn=33 mW. (a) Output spectra; (b) FWHM of spectra and TBPs; (c) autocorrelation traces

Fig. 5. (a) Output spectrum of 1015-1080 nm tunable mode-locked laser; (b) needed pump powers of single-pulse mode-locked at different wavelength

Fig. 6. Output results of 1015-1080 nm tunable mode-locked laser versus operating wavelength. (a) Pulse durations and TBPs versus wavelength; (b) output peak powers versus wavelength

Fig. 7. Output power stability test for a duration of 5 h