The development of high-intensity ultrafast laser facilities provides the possibility to create novel physical phenomena and matter states. The timing fluctuation of the laser pulses is crucial for pump–probe experiments, which is one of the vital means to observe the ultrafast dynamics driven by intense laser pulses. In this paper, we demonstrate the timing fluctuation characterization and control of the front end of a 100-PW laser that is composed of a high-contrast optical parametric amplifier (seed) and a 200-TW optical parametric chirped pulse amplifier (preamplifier). By combining the timing jitter measurement with a feedback system, the laser seed and preamplifier are synchronized to the reference with timing fluctuations of 1.82 and 4.48 fs, respectively. The timing system will be a key prerequisite for the stable operation of 100-PW laser facilities and provide the basis for potential pump–probe experiments performed on the laser.

相比于传统基于声纳、光缆的水下频率传递技术，水下激光频率传递技术具有更高的灵活性。本文首先介绍了水下激光频率传递技术的背景与意义，同时简要展示了国内外科研机构在水下激光频率传递方面的成果。然后，从理论上描述了水下链路特性的时域和频域特性，前者基于水体折射率微扰，后者基于柯尔莫哥洛夫大气湍流模型。接着，重点报道了电子科技大学在该领域的研究进展，包括电学相位补偿技术、光学相位补偿技术和多址频率分发技术。最后总结了这三类水下频率传递实验，对课题组在水下激光频率传递方面将要进行的工作进行了展望。作为具有较大潜力的水下频率传递技术，未来水下激光频率传递技术将在相关应用中发挥重要作用。