Picosecond frequency-resolved optical gating based on a modified ptychographic-based algorithm for use in a petawatt laser
Picosecond frequency-resolved optical gating based on a modified ptychographic-based algorithm for use in a petawatt laser
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基于改进的叠层记录算法的皮秒频率分辨光选通，用于拍瓦激光器
DOI：
10.1117/1.oe.59.5.054103
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发表时间：
2020
影响因子：
1.3
通讯作者：
Zhu J.
中科院分区：
文献类型：
--
作者：
Pan L.;Ouyang X.;Zhang X.;Zhu P.;Liu C.;Li Z.;Zhu B.;Zhu J.;Zhu J.
抽象的。强度和相位分布的准确时间特征对于拍瓦 (PW) 级的诊断非常重要。我们提出了一种基于自相关器的单次皮秒频率分辨光门控 (ps-FROG) 设置，该自相关器具有 ps 测量范围，可通过精细光栅进行光谱解析。使用具有变化的更新系数的改进的基于叠图的算法来重建脉冲分布；能够更好地适应大时宽乘积的脉冲重构。我们在100μJ ps激光系统中校准和验证了自制的ps-FROG，并用它来表征神光二号装置的PW激光系统产生的脉冲分布。该系统在重构ps脉冲的强度和相位分布方面表现出良好的性能和较高的精度，为精确调整光栅对获取预设脉冲宽度提供了参考。
Abstract. Accurate temporal characterization both in intensity and phase distribution is important in the diagnosis of the petawatt (PW) class. We present a single-shot picosecond frequency-resolved optical gating (ps-FROG) setup based on an autocorrelator with ps measurement range that is spectrally resolved through a fine grating. The modified ptychographic-based algorithm with a changing update coefficient was used for the reconstruction of the pulse distribution; it can better adapt to the reconstruction of pulse with a large time–bandwidth product. We calibrated and verified the homemade ps-FROG in a 100-μJ ps laser system and used it to characterize the pulse distribution generated by the PW laser system of the Shen Guang II facility. The system shows good performance and high accuracy in reconstructing the intensity and phase distributions of a ps pulse, which provides reference for accurately adjusting the grating pair to acquire the pulse width as a preset.