太瓦飞秒脉冲激光峰值功率测量装置及测量不确定度分析

朱光毅; 金尚忠; 吴磊; 薛媛元; 莫云龙; 尤越; 张云龙; 俞兵; 杨鸿儒; 董再天; 卢飞

doi:10.5768/JAO202445.0203001

太瓦飞秒脉冲激光峰值功率测量装置及测量不确定度分析

Peak power measurement device of terawatt femtosecond pulsed laser and measurement uncertainty analysis

摘要

摘要: 超短超强脉冲激光（飞秒强激光）具有极高的峰值功率，在激光惯性约束聚变、高能物理、激光微加工等领域具有广阔的应用前景。飞秒脉冲激光峰值功率是评价超短超强脉冲激光系统性能的重要参数。介绍了基于光谱相位相干直接电场重构法的太瓦量级飞秒脉冲激光峰值功率测量方法、测量装置组成和工作原理，搭建了一套太瓦量级的飞秒脉冲激光峰值功率测量装置，分析和讨论了影响太瓦激光峰值功率测量结果的测量不确定度分量来源和主要因素。测量峰值功率的重复性为2.9%，测量不确定度达到17.6%（k=2），有效解决了太瓦量级飞秒激光峰值功率测量问题。

Abstract: Ultra-short and ultra-intense pulsed lasers (femtosecond lasers) possess extremely high peak power, and hold broad application prospects in laser inertial confinement fusion, high-energy physics, laser micro-processing and other fields. The peak power of femtosecond pulsed lasers is a crucial parameter for evaluating the performance of ultra-short and ultra-intense pulsed laser systems. A peak power measurement method of terawatt-level femtosecond pulsed laser based on the spectral phase coherent direct electric field reconstruction was introduced, along with the composition and working principles of the measurement device. A set of peak power measurement device of terawatt-level femtosecond pulsed laser was constructed, and the sources as well as main factors of measurement uncertainty influencing the measurement results of peak power were analyzed and discussed. The repeatability of the peak power measurement is 2.9%, and the measurement uncertainty reaches 17.6% (k=2), which effectively addresses the issue of peak power measurement of terawatt-level femtosecond laser.

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