为了实现皮秒拍瓦激光的精密测试，研制了专用的皮秒自相关仪。选用无色散元件，提高了测量结果的可靠性。采用自标定方法标定时间分辨率，用超限法标定时间测量范围，用极值法标定脉冲响应特性。实验结果表明，皮秒自相关仪的时间分辨率为0.1 ps/pixel，时间测量范围为26 ps，脉冲响应特性的值为300 fs。该皮秒自相关仪能够满足皮秒啁啾脉冲的时间宽度精密测试要求。

In order to realize precise diagnostics for pico-second pulse of peta-watt laser, an auto-correlator especially for single shot pico-second pulse is developed. Optical elements with no dispersion are used in this pico-second auto-correlator′s design, which could improve its precise. Three methods are adopted to testify its characters. Self-calibration is used for time resolution. Over-range is used for time range. Limitation is used for impulse response function. Experiments results show that its time resolution is 0.1 ps/pixel, its time range is 26 ps, and its impulse response function value is 300 fs. So this auto-correlator can fulfill the requirement of precised measurement on pulse width for chirped pulse of pico-second peta-watt laser.