Fig. 1. (a) Schematic diagram of the laser system. LD, laser diode; IBP, isolator/bandpass filter hybrid; SM, single mode; YDF, Yb³⁺-doped fiber; AOM, acousto-optic modulator; ISO, isolator. (b) Time sequence of seed and pump pulses.

Fig. 2. Evolution of the pulse shape during the secondary pre-compensation process. (a) The signal waveform for the seed driver and the pulse train of the seed. (b) The signal waveform from the AWG and the burst-mode pulse waveform after AOM modulation.

Fig. 3. Performance of the output burst-mode laser. (a) Variation of pulse energy with different pump energies of the main amplifier. (b) Temporal shape of the pulse with different pulse energies. (c) Comparison of the intra-burst pulse in detail between the seed and output. (d) Spectrum evolution of the seed and main amplifier.

Fig. 4. The envelope uniformity factors with different input energies as a function of main amplifier pump energy. Inset: diagram of the calculation region of the envelope uniformity factor.

Fig. 5. RF spectrum of different frequencies ranging from 0.5 to 10 GHz.

Fig. 6. Performance of the output under different intra-burst duty cycles at the same pump energy (42.3 mJ) when the intra-burst repetition rate is fixed at 1 GHz. (a) The energy and peak power. (b) The waveform details of the intra-burst pulse. (c) The spectra in the 300 nm scanning range.

Fig. 7. The long-term stability of energy, measured at an output energy of 13.3 mJ (50 ns, 1 GHz).