基于超稳激光的大型被动激光陀螺仪的研究

项目名称： 基于超稳激光的大型被动激光陀螺仪的研究

项目编号： No.91536116

项目类型： 重大研究计划

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 张洁

作者单位： 华中科技大学

项目金额： 90万元

中文摘要： 高灵敏度的地球自转角速度测量在惯性导航、卫星定位、地球物理和基础物理等许多领域有着重要的作用。本项目意在通过对大型被动激光陀螺仪的研究，将地球自转的测量推进到新的灵敏度范围，发挥它在基础物理前沿和国家重大战略需求中的重要作用。本项目研究基于超稳激光的大型被动激光陀螺仪，其尺度稳定性由超稳激光控制。超稳激光的短稳锁定到一个超稳腔上，长稳锁定到由氢钟参考的飞秒光纤光梳上。通过计算表明，设计的大型被动激光陀螺仪可用于开展广义相对论的验证、万有引力常数G是否随时间变化等基础物理实验。我们计划搭建一个周长4 m，面积1 m^2的大型被动激光陀螺仪H-ring作为验证方案可行性的原理样机，灵敏度目标为5*10^(-10) rad/s/√Hz。

中文关键词： 超稳激光；飞秒光梳；大型激光陀螺仪；地球自转；干涉仪

英文摘要： High sensitivity Earth rotation measurement plays an important role in inertial navigation, satellite positioning, geophysics and fundamental physics. Our project aims to improve the Earth rotation measurement to a new sensitivity level through the research on large passive ring laser gyroscope, which has important applications in the frontier of fundamental physics and major national strategy demands. The project focuses on the research of a large passive ring laser gyroscope based on ultra-stable lasers. The scale factor of the gyroscope will be controlled by the ultrastable lasers. The short term stability of the ultrastable laser is stabilized by an ultrastable cavity, and its long term stability is controlled by an optical frequency comb which is referenced to an H-maser. According to our calculations, the designed large passive ring laser gyroscope can be used in many fundamental physical experiments, such as experimental tests of the General Relativity, time variance of the gravitational constant G, and so on. We plan to build a large passive ring laser gyroscope H-ring with a perimeter of 4 m, and an area of 1 m^2 as a feasibility prototype. The sensitivity of the gyroscope can reach a level of 5*10^(-10) rad/s/√Hz.

英文关键词： Ultrastable laser;Femtosecond optical frequency comb;Large ring laser gyroscope;Earth rotation;Interferometer