用贝叶斯方法重新定义激光单次测量，提升精度60%。
A Bayesian perspective on single-shot laser characterization
- 基于贝叶斯框架，重新定义单次测量的判定标准。
- 在ATLAS-3000装置上实现脉冲前倾与曲率的定量不确定性边界。
- 适用于需要精确控制激光-物质相互作用的高能物理场景。
我们提出一种贝叶斯框架，用于测量超高峰值功率激光中的空间-时间耦合（STCs），重新定义了‘单次测量’的内涵。突破传统单/多次测量的划分，该方法提供了严格标准，判断测量是否能分辨单个激光脉冲而非统计平均。研究表明，单次测量能力并非设备固有属性，而是由测量精度与系统参数固有变异性之间的关系决定。在ATLAS-3000拍瓦激光装置上实现新测量设备，首次获得脉冲前倾和曲率的定量不确定性范围。显著的是，相比传统方法，该贝叶斯方法将不确定性降低高达60%。分析揭示了测量精度与系统内在变异性之间的权衡，直接影响对激光-物质相互作用的精密控制应用。
原文摘要 · Abstract (English)
We introduce a Bayesian framework for measuring spatio-temporal couplings (STCs) in ultra-intense lasers that reconceptualizes what constitutes a 'single-shot' measurement. Moving beyond traditional distinctions between single- and multi-shot devices, our approach provides rigorous criteria for determining when measurements can truly resolve individual laser shots rather than statistical averages. This framework shows that single-shot capability is not an intrinsic device property but emerges from the relationship between measurement precision and inherent parameter variability. Implementing this approach with a new measurement device at the ATLAS-3000 petawatt laser, we provide the first quantitative uncertainty bounds on pulse front tilt and curvature. Notably, we observe that our Bayesian method reduces uncertainty by up to 60% compared to traditional approaches. Through this analysis, we reveal how the interplay between measurement precision and intrinsic system variability defines achievable resolution -- insights that have direct implications for applications where precise control of laser-matter interaction is critical.
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