Fig. 1. Device diagram of wavelength-tunable 1 μm ultrashort pulse fiber laser based on pump beam splitting

Fig. 2. Experimental results. (a) Pulse train of ultrashort pulse laser oscillator; (b) output spectrum of ultrashort pulse laser oscillator with frequency spectrum of oscillator shown in inset

Fig. 3. Spectra under different output powers with FTL pulse widths under different powers shown in inset

Fig. 4. Experimental results. (a) Frequency spectra under different output powers; (b) pulse widths under different output powers

Fig. 5. Stability of ultrashort pulse light source at 156 mW output power