基于重构时间-波长序列的快速高分辨光谱分析技术及核心器件研究

光谱分析技术是研究光与物质相互作用的重要手段，而针对一些快速动态过程的研究，对光谱采样频率有着越来越高的要求。本项目主要研究快速高分辨大带宽的光谱分析，目标实现不小于10MHz的采样频率、1pm的光谱分辨率以及35nm的观测带宽。通过时域聚焦实现重构时间-波长序列，结合高速时域探测技术，开展理论分析、芯片研制、系统搭建与测试工作。通过差频双光频梳的时域放大特性，与时域聚焦方案结合，克服时域探测带宽的限制，实现高分辨的光谱分析。重点研究基于光子集成技术的核心器件，探索大转换带宽的非线性波导和非简并四波混频过程；探索高重复频率的微环及锁相方式，提高采样频率；探索两种方案的结合，设计片上的脉冲包络提取。研究高阶色散控制，优化时域聚焦，提升光谱分辨率；研究时域稳定性，提升光谱的绝对精度。最终利用本项目方案，研究和观测一些超快光谱动态过程，探索更多维度测量应用与高速时域探测的结合。

Optical spectrum analysis is an essential method to study the interaction between light and matter. To explore some ultrafast dynamics, it is demanded that the optical spectrum analysis should have high acquisition frame rate. This project is mainly focused on the ultrafast spectroscopy, aimed at realizing over 10-MHz frame rate, 1-pm spectral resolution, and 35-nm observation bandwidth. Reconstruct the time-wavelength sequence based on the temporal focusing mechanism, as well as the high-speed temporal detection, and sequentially carry out theoretical analysis, chip development, system implementation and testing. Leverage the temporal magnification of the dual optical frequency combs structure, to overcome the bandwidth limitation of the temporal focusing mechanism, and realize high spectral resolution. Mainly explore some core devices based on the optical integration technology: enlarge the conversion bandwidth of the nonlinear parametric mixing waveguide; improve the repetition rate of the micro-ring cavity, and its phase-locking schemes; for the combination of these two mechanisms, explore the on-chip implementation of the pulse envelop extraction. Explore higher-order dispersion control in the temporal imaging system to achieve finer resolution, and improve the temporal stability to achieve high spectral accuracy. Leverage the proposed scheme to observe some ultrafast spectral dynamics, and combine it with the measurement of some other dimensions to realize the ultrafast temporal acquisition.