近日，以色列内盖夫本-古里安大学Frumker, Eugene团队研究了激光诱导强场电离现象的原位表征。该项研究成果发表在2025年4月21日出版的《光：科学与应用》杂志上。

准确表征相互作用体积内强场飞秒脉冲的强度和持续时间对于阿秒科学至关重要。然而，这仍然是一个主要的瓶颈，限制了强场的精度，特别是高次谐波产生实验。研究组提出了一种新的方案，用于在相互作用焦点区域内原位测量和控制空间分辨的强场飞秒脉冲强度和持续时间。

该方法将共轭焦成像与使用与阿秒科学实验相关的气体密度的原位离子测量相结合。氦和氩的独立测量，伴随着对强场电离动力学模型的拟合，在广泛的气体密度范围内产生了准确和一致的结果，并强调了双电离和势垒抑制电离的重要性。驱动激光的直接空间分辨表征是解决相互作用体积中平均问题的关键一步，为更准确和可靠的阿秒实验铺平了道路。

附：英文原文

Title: In situ characterization of laser-induced strong field ionization phenomena

Author: Shlomo, Noam, Frumker, Eugene

Issue&Volume: 2025-04-21

Abstract: Accurately characterizing the intensity and duration of strong-field femtosecond pulses within the interaction volume is crucial for attosecond science. However, this remains a major bottleneck, limiting accuracy of the strong-field, and in particular, high harmonic generation experiments. We present a novel scheme for the in situ measurement and control of spatially resolved strong-field femtosecond pulse intensity and duration within the interaction focal region. Our approach combines conjugate focal imaging with in situ ion measurements using gas densities pertinent to attosecond science experiments. Independent measurements in helium and argon, accompanied by a fitting to a strong-field ionization dynamic model, yield accurate and consistent results across a wide range of gas densities and underscores the significance of double ionization, as well as barrier suppression ionization. Direct spatially resolved characterization of the driving laser is a critical step towards resolving the averaging problem in the interaction volume, paving the way for more accurate and reliable attosecond experiments.

DOI: 10.1038/s41377-025-01808-y

Source: https://www.nature.com/articles/s41377-025-01808-y