新型全光抑噪结构的超窄线宽单频光纤激光器技术研究

低噪声窄线宽光纤激光器在相干激光通信、激光雷达、远距离分布式光纤传感、引力波探测等相干检测领域有着广泛的应用前景，是各发达国家竞相发展的前沿激光技术。本项目针对窄线宽单频光纤激光器综合性能进一步提升所遇到本质性关键技术问题，如频率噪声和强度噪声抑制、激光线宽压窄、稳定偏振模式激光输出等，拟开展基于弱光栅复合谐振腔慢光特性新型全光抑噪方式的超窄线宽单频光纤激光器关键技术及相关机理问题的研究。研究内容包括：设计全光噪声抑制的复合谐振腔方案，建立激光器噪声传递函数理论模型，获得激光器频率噪声和强度噪声性能的优化；分析有源谐振器和保偏光栅的偏振模式的耦合、匹配、竞争和选择，实现稳定的高消光比线偏振光输出；建立完整的激光线宽、强度噪声和频率噪声的综合测试体系，对激光性能进行全面的评价和表征，并进行深入的机理仿真分析和实验验证研究，为下一代全光抑噪的超窄单频光纤激光器性能提升提供理论依据和技术支撑。

Low noise and narrow linewidth fiber lasers have wide applications in the fields of coherent detection, such as coherent optical communication, lidar, distributed fiber sensors, gravitational wave detection. This project aim is to solve the key problem for improving the performances of single frequency fiber laser, including the compression of frequency and intensity noises, laser linewidth narrowing and so on. In order to realize this aim, the slow-light characteristic of a composite fiber resonator with the weak fiber Bragg grating will be used. The related research contents including: designing the all-optical noise suppresion scheme based on the composite fiber resonator, building the theoretical model of laser noise transfer function to improve the performance of laser noise, analyzing modle-couple in the active fiber resonator, and finally building the test platform of laser performance. This research will provide a large amount of data and experimental confirmation which will also be useful for the improvement of Low noise and narrow linewidth fiber lasers.