论文标题
通过棱镜辅助侧耦合，电离诱导的气体填充PCF模态指数变化的时空测量
Spatio-temporal measurement of ionization-induced modal index changes in gas-filled PCF by prism-assisted side-coupling
论文作者
论文摘要
我们报告使用棱镜辅助的侧耦合来研究AR填充的空心光子光子晶体中光离子化的时空动力学。通过启动四种不同的LP核心模式，我们能够在电离事件发生后，从几百个picseconds到几百微秒的时间表上的模态屈光索引中的时间和空间变化。我们通过实验性地分析了潜在的气体密度波，并与定量和质量流体动力学预测有很好的一致性。此外，我们观察到几微秒的MHz范围内的定期调制，表明纤维结构的纳米尺度振动，由气体密度波驱动。
We report the use of prism-assisted side-coupling to investigate the spatio-temporal dynamics of photoionization in an Ar-filled hollow-core photonic crystal fiber. By launching four different LP core modes we are able to probe temporal and spatial changes in the modal refractive index on timescales from a few hundred picoseconds to several hundred microseconds after the ionization event. We experimentally analyze the underlying gas density waves and find good agreement with quantitative and qualitative hydrodynamic predictions. Moreover, we observe periodic modulations in the MHz-range lasting for a few microseconds, indicating nanometer-scale vibrations of the fiber structure, driven by gas density waves.
