基于电磁诱导透明谐振腔线宽压窄效应的空间引力波探测用激光稳频技术研究

Space-based gravitational wave detection places very stringent requirements on the linewidth , frequency stability and environmental stability of the laser. This project propose a new laser frequency stabilization technique based on electromagnetically induced transparency cavity linewidth narrowing effect which could be used in space-based gravitational wave detection. This technique can not just further narrow the linewidth of the cavity and have large tuning capability , but also maintain the high stability of the atomic absorption reference.The main research contents are: based on electromagnetically induced transparency and previous theoretical and experimental work, optimize the parameters such as the cavity finesse, the coupling and probe laser field ,the reference cell and etc to obtain the narrowest linewidth and utilize this narrow reference to stabilize the output frequency of the laser. This technique is a new way to improve the frequency stability performance of the space laser and has great value and research significance

空间引力波探测对激光器的线宽、频率稳定性和空间环境适应性等都提出了极为苛刻的要求。本申请提出了一种可用于空间引力波探测的基于腔内原子电磁诱导透明双暗态谐振腔线宽压窄效应的激光稳频技术。该技术得到的窄线宽频率参考利用电磁诱导透明效应的高色散特性来显著降低谐振腔的谐振线宽且保留了原子吸收峰高稳定性的优点并可调谐，有望解决现有技术存在的短期稳定性和长期稳定性难同时满足，调谐性能差及空间环境适应性不佳的缺点，非常适合在空间引力波探测用激光器中采用。主要研究内容有：基于电磁诱导透明双暗态效应，在理论和实验的基础上，优化实验参数，如腔的精细度、探测和耦合光场的参数、原子气室的参数等实现最窄的谐振峰输出和调谐并利用此窄线宽谐振峰优化解调方法和反馈参数，实现高稳定性的稳频激光输出，并进行初步的环境摸底实验。本技术是提高空间激光器稳频性能的新技术和新方法，具有非常高的研究意义和应用价值。

空间引力波探测对激光器的线宽、频率稳定性和空间环境适应性等都提出了极为苛刻的要求。本课题提出了一种可用于空间引力波探测的基于腔内原子电磁诱导透明双暗态谐振腔线宽压窄效应的激光稳频技术，完成了实验验证，实现谐振腔线宽的压窄并采用此窄线宽谐振峰作为频率参考实现激光器的频率稳定和调谐，同时谐振峰线宽达到250KHz，初步验证了技术方案的可行性；同时提出了一种新的全光纤结构稳频方案，线宽也可到100KHz量级，初步实现了稳频效果。共发表包括Optics Express等高水平论文3篇，申请专利7项，其中授权5项。培养研究生3名。