Fig. 1. Schematic of optical path for time synchronization measurement in SG II upgrade facility

Fig. 2. Waveforms of pulse-sequence beam source. (a) Pulse envelope; (b) sub-pulse sequence [shaded box in Fig. 2(b) corresponds to shaded box in Fig. 2(a)]

Fig. 3. Time synchronization measurement results based on pulse-sequence beam source. (a) Normalized reference and target signals with inset showing mismatch between signal sub-pulse sequences; (b) correlation curve between reference and target signals; (c) pulse envelopes of reference and time-offset target signals; (d) sub-pulse sequences of reference and time-offset target signals [corresponding to shaded box in Fig. 3(c)]

Fig. 4. Synchronization measurement accuracy between beams in alignment beam method. (a) Measurement result for single beam pair; (b) RMS statistical result for 13 beam pairs

Fig. 5. Time synchronization adjustment results of 16 nanosecond laser beams from SG II upgrade facility