时域展宽是脉冲激光在水下传输时的重要特性，直接影响蓝绿激光对潜通信和水下激光成像等水下光电应用的性能。推导了选通深度曲线的特征参数与脉冲激光回波波形参数和增强型电荷耦合器件(ICCD)选通波形参数的关系，从而提出了基于选通深度曲线的脉冲激光水下传输时域展宽测量方法。利用所搭建的高重频脉冲激光水下成像系统，在大型室内船池中进行实验测量。结果表明，所提方法能够有效完成脉冲激光在水下传输时的时域展宽测量，尤其适用于远距离传输的情况。

Time-domian broadening is one of the very important features of laser pulse propagating underwater, which affects the performances of blue-green laser submarine communication system and underwater laser imaging system directly. The relationship between characteristic parameter of depth of gating (DOG) profile and that of laser echo profile and intensified change coupled device (ICCD) gating profile is deduced, which is the theoretical foundation of the proposed method to measure the time-domian broadening of underwater laser pulse. With the help of the high RPF laser underwater imaging system constructed by our term, the laser pulse time-domian broadening in large-scale tank is experimentally measured. The results show that the method proposed works well and is suitable for the conditions at long range.