基于偏振谐振腔的光旋角高灵敏高稳定检测方法研究

The high precision inertial measurement can be achieved due to the effect of the atomic spin axis fixed effect in a weak magnetic field, which makes itself one of the most potential research topic. But recent years inertial measurement accuracy has not been achieved by a breakthrough, one of the main reasons is the current-widespread use of polarization-intensity conversion detection method, because environmental noise coupling in to the system lead to the inertial measurement accuracy greatly reduced. .Aiming at the above problems, this project proposes a new detection method based on polarization cavity, in order to improve the short-term sensitivity and long term drift of an atomic inertial measurement by means of polarization-frequency conversion. The use of high Q polarization resonant cavity characteristics of high sensitivity to optical rotation vectors which containing information rotation angle; meanwhile, using the cavity as a medium, transfer the stability of atomic spin to the level of detection of optical rotation angle. .The expected results of the project, not only has theoretical and practical value to improve the atomic inertial measurement system on short-term sensitivity and long-term drift index, but also is of great significance for high precision optical system precision of linear polarization rotation angle detection.

由于弱磁场下原子自旋效应可以实现超高精度惯性测量，使其成为量子导航领域最具潜力研究方向之一。但若干年来惯性测量精度始终无法取得突破，最主要原因之一是目前普遍采用偏振-光强转换的光旋角检测方式，因光强耦合难于隔离的环境噪声而导致惯性测量精度大幅降低。.本项目针对上述问题，提出基于偏振谐振腔的检测新方法，以期用偏振-频率转换的检测方式提高原子惯性测量短期灵敏度与长期漂移指标。利用偏振谐振腔的高Q值特性对包含载体转动信息的光旋角进行高灵敏探测；同时利用谐振腔作为媒介，将原子自旋能级的稳定性传递到对光旋角的检测上，实现高稳定检测的目标。.本项目的预期研究成果，不仅对提高原子惯性测量系统短期灵敏度及长期漂移指标有理论和实践价值，同时对基于微小线偏振光旋角检测的高精密光学系统精度的提高有重要的启示意义。

由于弱磁场下原子自旋定轴效应可以实现超高精度惯性测量，使其成为量子导航领域最具潜力研究方向之一。但若干年来惯性测量精度始终无法取得突破，最主要原因之一是目前普遍采用偏振-光强转换的检测方式，因光强耦合难于隔离的环境噪声而导致惯性测量精度大幅降低。.本项目按照研究计划基于实验室现有的研究平台和技术研究基础，以实现高灵敏惯性角速度测量为目标，以基于SERF（Spin Exchange Relaxation Free，无自旋交换弛豫）原子自旋惯性测量方法为研究对象，深入开展了高灵敏、高稳定光旋角检测方法及实验研究。具体来讲，（1）开展了基于偏振谐振腔的光旋角高灵敏检测方法研究，为实现微小光旋角检测提供了技术基础；（2）深入开展了谐振腔双模联动锁定研究，提高了基于SERF态原子惯性测量检测系统的稳定度；（3）将该检测方法应用到惯性测量系统中，得到了先进的惯性测量灵敏度指标。本项目的研究成果，对提高该惯性测量系统短期灵敏度及长期漂移指标有理论和实验研究意义，同时对微小线偏振光旋角检测光学系统精度的提高提供了重要思路。