新型光调制双光梳光谱技术

We proposed a novel method to generate femtosecond optical dual comb source for dual comb spectroscopy. By using a frequency stabilized continuous laser as a seed light, and two high power femtosecond mode-lock fiber Laser at slightly different repetition frequencies as the pump light, the seeded signal laser, a narrow line width CW laser, is modulated by the femtosecond pump laser with different repetition rate, which here serves as a broad bandwidth optical modulator. This subject intends to use the mechanism of seed injection, so that the resulting optical frequency comb has excellent signal-to-noise ratio, and it is expected to realize the integrated and stable long-term operation of the optical frequency comb. In addition, the optical frequency comb generated by the mechanism based on parametric amplification has relative flexibility in spectral tuning width, and can achieve highly sensitive, high-precision and high-resolution coherent heterodyne spectrum detection with comb-teeth resolution. We hope that we can realize real-time dynamic monitoring of gas molecules and liquid molecules and apply them to the environmental monitoring and precision measurement of aerospace.

申请人提出一种新型的飞秒激光双重频光学高相干频率梳的产生机制与方法，利用稳频连续激光作为种子光，稳定重复频率差的低噪声高功率飞秒光纤飞秒激光源作为泵浦光，通过光学参量放大的技术调制连续稳频激光直接产生宽谱的飞秒信号光双光梳。本课题拟采用种子注入的机制，使产生的光学频率梳具有优良的信噪比特性，可有望实现光学频率梳的集成化稳定长期运转。此外，这种基于参量放大的机制产生的光学频率梳，在光谱调谐宽度上具有相对的灵活性，可以实现梳齿分辨力的高灵敏、高精度、高分辨的相干外差光谱探测。实现对气体分子，液体分子的实时动态监测，应用于环境监测，航空航天的精密测量中。

本项目通过一种新型的飞秒激光双重频光学高相干频率梳的产生机制与方法，利用稳频连续激光作为种子光，稳定重复频率差的低噪声高功率飞秒光纤飞秒激光源作为泵浦光，通过光学参量放大的技术调制连续稳频激光直接产生宽谱的飞秒信号光双光梳。最终实现梳齿分辨力的高灵敏、高精度、高分辨的相干外差光谱探测以及对多种气体分子的灵敏探测。实现长时间大于24小时的稳定运转的光学频率梳。实现光学精度在百kHz以下，采样精度在百MHz左右，刷新速度在kHz量级的高速高精度气体光谱的灵敏探测。.项目完成了预计的研究内容和研究目标，依托本项目分别搭建了近红外和中红外双光梳光谱实验平台，并完成原理样机一套（商用发动机集团航空发动机尾气测量项目）和工程样机2台（北京航天计量测试技术研究所联合承担计量前端项目），依托本项目毕业博士2名，发表论文5篇，其中1区论文2篇，发明专利1项。