Fig. 1. Deviation of beam pointing due to instability of two parallel mirrors

Fig. 2. Deviation of beam pointing due to instability of two perpendicular mirrors

Fig. 3. Schematic of single-shot autocorrelation measurement of picosecond pulse

Fig. 4. Modulation function and autocorrelation signal of sine distribution with 0 phase. (a) Sine function and sine function after mirror; (b) theoretical autocorrelation signal, normal structure autocorrelation signal and mirror structure autocorrelation signal

Fig. 5. Autocorrelation signal by the sine modulation. (a) With +π/2 phase shift; (b) with -π/2 phase shift

Fig. 6. Modulation function and autocorrelation signal of cosine distribution with 0 phase. (a) Cosine function and cosine function after mirror; (b) theoretical autocorrelation signal, normal structure autocorrelation mirror and mirror structure autocorrelation signal

Fig. 7. Autocorrelation signal by the cosine modulation. (a) With -π/2 phase shift; (b) with +π/2 phase shift

Fig. 8. Effects of (a) modulation period and (b) modulation depth on the pulse width measurement

Fig. 9. Error of the pulse width measurement by combining with the effects of beam pointing and the near field distribution

Fig. 10. Schematic diagram of picosecond parameter measurement system at the SG-II facility

Fig. 11. (a) Schematic of the large size grating; (b) spot map of the near-field of petawatt laser

Fig. 12. Experimental results. (a) Slit is perpendicular to the axis of time; (b) slit is parallel to the axis of time