皮秒参数测量系统用于提供皮秒拍瓦激光系统的各项状态参数，协助激光系统达到预期的技术指标。针对皮秒拍瓦激光系统的技术指标，皮秒参数测量系统将提供压缩脉冲的能量、脉宽、远场、信噪比等参数。为了判断参数测量系统的工作性能，采用均方根(RMS)误差来描述测量系统的可靠性。经过实验测试，能量测量单元的测量范围为10~1000 J，标定实验数据的RMS误差为2.2%。脉宽测量单元的时间测量范围为0.5~18.0 ps，时间分辨率为0.07 ps，测试数据的RMS误差为3%。远场测量单元的空间测量范围为150倍衍射极限(DL)，空间分辨率为0.3倍DL，测试数据的RMS误差为0.15%。信噪比测量单元的时间测量范围为30 ps，时间分辨率为0.3 ps，动态范围为106。基于拍瓦实验提供的测试数据表明，皮秒参数测量系统能够稳定可靠地提供以上参数的实时测试数据，实现拍瓦装置的运行状态诊断功能。

Picosecond diagnostics system is used to provide parameters of laser facility and help it to achieve designed technical aim. This system will diagnose parameters of compressed pulse for petawatt laser such as energy, pulse width, farfield, and pulse contrast. Root-mean-square (RMS) error is adopted to describe stability of diagnostics system in order to test its performance. Energy measurement range is 10~1000 J, RMS error of calibration data is 2.2%. Pulse width measurement range is 0.5~18.0 ps, temporal resolution is 0.07 ps for Gaussian type pulse, and data RMS error is 3%. Farfield measurement range is 150 diffraction limitation (DL), spatial resolution is 0.3 DL, and RMS error is 0.15%. Pulse contrast measurement range is 30 ps, temporal resolution is 0.3 ps, and dynamic range is 106. In experiments on petawatt laser, picosecond diagnostics system provides these parameters instantaneously and successfully to analyze petawatt laser facility′s performance.