AI 中文总结
本文开发了一种振荡器驱动的宽带飞秒瞬态显微光谱系统，采用光子晶体光纤产生超连续谱探针，可实现高灵敏度、高时空分辨率的显微光谱测量，成功解析了低维材料的局域超快载流子动力学。
AI 中文摘要
本文提出一种基于光子晶体光纤（PCF）中超连续谱产生的振荡器驱动飞秒瞬态显微光谱系统。该系统以80 MHz频率运行，无需脉冲放大，采用适用于显微光谱的低脉冲能量即可实现探测灵敏度优于10^-4的高灵敏度测量；优化PCF长度（≤50 mm）可抑制色散诱导的啁啾，在450-900 nm波段实现低于100 fs的近乎均匀时间分辨率。高重复频率运行支持快速光谱采集与高效降噪，该系统具备微米级空间分辨率，支持反射与透射两种配置，成功解析了多层及单层MoS₂的超快载流子动力学，包括单个单层薄片内的空间依赖弛豫，证明其是探测低维材料局域超快动力学的通用平台。
英文摘要
We present an oscillator-driven femtosecond transient microspectroscopy system based on supercontinuum generation in a photonic crystal fiber (PCF). The system operates at 80 MHz without pulse amplification, enabling high-sensitivity measurements with a detection sensitivity better than $10^{-4}$ while using low pulse energies suitable for microspectroscopy. Optimization of the PCF length ($\leq 50$ mm) suppresses dispersion-induced chirp, achieving nearly uniform temporal resolution below 100 fs across 450-900 nm. The high-repetition-rate operation allows rapid spectral acquisition and efficient noise reduction. The developed system provides micrometer-scale spatial resolution and supports both reflection and transmission configurations. Ultrafast carrier dynamics in multilayer and monolayer MoS$_2$ are successfully resolved, including spatially dependent relaxation within a single monolayer flake. These results demonstrate a versatile platform for probing local ultrafast dynamics in low-dimensional materials.
