Wu Chaoneng, Li Lu, Yeung Mark, Wu Sizhong, Cousens Steven, Tietze Stefan, Dromey Brendan, Zhou Cangtao, Ruan Shuangchen, Zepf Matt
Opt Express. 2022 Jan 3;30(1):389-402. doi: 10.1364/OE.444043.
In this study, we propose two full-optical-setup and single-shot measurable approaches for complete characterization of attosecond pulses from surface high harmonic generation (SHHG): SHHG-SPIDER (spectral phase interferometry for direct electric field reconstruction) and SHHG-SEA-SPIDER (spatially encoded arrangement for SPIDER). 1D- and 2D-EPOCH PIC (particle-in-cell) simulations were performed to generate the attosecond pulses from relativistic plasmas under different conditions. Pulse trains dominated by single isolated peak as well as complex pulse train structures are extensively discussed for both methods, which showed excellent accuracy in the complete reconstruction of the attosecond field with respect to the direct Fourier transformed result. Kirchhoff integral theorem has been used for the near-to-far-field transformation. This far-field propagation method allows us to relate these results to potential experimental implementations of the scheme. The impact of comprehensive experimental parameters for both apparatus, such as spectral shear, spatial shear, cross-angle, time delay, and intensity ratio between the two replicas has been investigated thoroughly. These methods are applicable to complete characterization for SHHG attosecond pulses driven by a few to hundreds of terawatts femtosecond laser systems.
在本研究中，我们提出了两种全光学设置且单次可测量的方法，用于全面表征表面高次谐波产生（SHHG）中的阿秒脉冲：SHHG - SPIDER（用于直接电场重建的光谱相位干涉测量法）和SHHG - SEA - SPIDER（用于SPIDER的空间编码排列）。进行了一维和二维EPOCH粒子模拟，以在不同条件下从相对论等离子体中产生阿秒脉冲。两种方法都广泛讨论了以单个孤立峰值为主的脉冲序列以及复杂的脉冲序列结构，相对于直接傅里叶变换结果，这两种方法在阿秒场的完整重建中显示出优异的精度。基尔霍夫积分定理已用于近场到远场的变换。这种远场传播方法使我们能够将这些结果与该方案的潜在实验实现联系起来。已全面研究了两种仪器的综合实验参数的影响，如光谱剪切、空间剪切、交叉角、时间延迟以及两个复制品之间的强度比。这些方法适用于由几太瓦到数百太瓦的飞秒激光系统驱动的SHHG阿秒脉冲进行完整表征。
