Fig. 1. Setup of the fiber amplification high power laser

Fig. 2. (a) Output spectra; (b) output pulse of Oscillator

Fig. 3. (a) AOM output signal of 500 kHz; (b) AOM input signal of 40 MHz

Fig. 4. (a) Average power, (b) pulse energy and (c) peak power of output signal at different stage amplifiers of laser system

Fig. 5. (a) Output power versus pump power of 85 μm PCFs amplifier; (b) output power versus input power via VBG

Fig. 6. Compression efficiency of VBG with different input power

Fig. 7. Final output beam profiles

Fig. 8. Output spectra

Fig. 9. Temporal profile of output pulse