Temporal characterization is important to diagnose and measure a petawatt (PW) class laser. We obtained the V curve of the pulse width versus the grating position using pulse width measurement with a mirror image configuration. The temporal range for pulse width was 18 ps with a resolution of 0.05 ps. We measured the pulse contrast between the and PW class laser within a single shot in the Shen Guang II facility. We measured the pulse contrast between the and PW class laser after expanding the temporal range. The temporal range was 70 ps, with a dynamic range of eight orders of magnitude.
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