Fig. 1. Structural diagram of experimental setup

Fig. 2. (a) Simulation of signal and pump power changed along YDF length; (b) variation in output power with YDF length

Fig. 3. Variation in SRS threshold power with YDF length

Fig. 4. (a) Variation in output power with pump power; (b) variation in output power with time in 180 min

Fig. 5. Output spectrum of 2.02 kW laser output power

Fig. 6. Beam quality of laser with output power of 2.02 kW

Fig. 7. Results of laser cutting