Fig. 1. Experimental setup. (a) Laser oscillator; (b) first stage of Yb-doped fiber amplifier; (c) femtosecond laser amplification loop; (d) picosecond laser amplification loop; (e) spectrum for the oscillator and the YDFA1

Fig. 2. Output characters of femtosecond laser amplifier. (a) Spectral width at different pump powers; (b) autocorrelation trace of dechirped pulse

Fig. 3. Output characters of picosecond laser amplifier. (a) Pulse duration and spectrum at 13.6 W output power and the spectrum after AOM; (b) relationship between output power, spectral width and pump power

Fig. 4. Resonant cavity repetition frequency locked jitter curve