全内腔微晶架构大型激光陀螺设计与激光动力学研究  

Design and Laser Dynamics of Zerodur-Based Full-Inner-Cavity Large Laser Gyroscopes

作　　者：毛元昊 谭中奇[1,2] 陈丁博 龚秋成 张斌[1,2] 吴素勇 刘贱平[1,2] 樊振方 罗晖[1,2] 龙兴武[1,2] Mao Yuanhao;Tan Zhongqi;Chen Dingbo;Gong Qiucheng;Zhang Bin;Wu Suyong;Liu Jianping;Fan Zhenfang;Luo Hui;Long Xingwu(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,Hunan,China;Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,Hunan,China)

机构地区：[1]国防科技大学前沿交叉学科学院,湖南长沙410073 [2]国防科技大学南湖之光实验室,湖南长沙410073

出　　处：《中国激光》2024年第22期51-57,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(62375285);湖南省自然科学基金(2023JJ30639);国防科技大学自主创新科学基金(22-ZZCX-063)。

摘　　要：实现独立自主、全天候、高频的世界时测量是建立健全国家完整时间溯源体系的关键一环,是我国载人航天、深空探测等重大任务的重要战略支撑。大型激光陀螺科学装置与大地固连,可以直接获得地球转动信号,是世界时测量的重要手段之一。展示了我国第一台采用光胶组合方案构建的边长为0.55 m的全内腔微晶架构大型激光陀螺仪NUDT-MRLG550。通过对激光动力学进行理论和实验研究,最终实现了功率为4μW的单纵模、基横模(TEM00)的稳定输出,在北纬28°处稳定观测到29.6 Hz的地球自转信号。Objective Independent, all-weather, and high-frequency universal time measurement is crucial for establishing a comprehensive national time-monitoring system in China. This system is vital for supporting major strategic tasks such as manned spaceflight and deep-space exploration. Large-ring laser gyroscopes, which are anchored to the Earth bedrock, provide direct acquisition of signals related to the Earth rotation and are vital to universal time measurement.Methods To balance the angular precision and dimensions of a large-ring laser resonator, an optical-contacted laser resonator is initially designed, which comprises a central block, four extension blocks, a gain block, and four quartz tubes. Subsequently, the cavity ring-down method is utilized to measure the losses of the fundamental transverse mode(TEM00) and high-order transverse modes to validate the rationality of the aperture design. The finite-element method is employed to simulate the laser plasma dynamics process, where the optimal He/Ne particle number ratio is obtained. By adjusting the gas pressure and pump current, a stable single longitudinal mode and the Earth rotation signal are achieved using the NUDT-MRLG550 laser gyroscope.Results and Discussions This study introduces China first large-ring laser gyroscope named NUDT-MRLG550, which is based on Zerodur glass. The gyroscope utilizes an optical-adhesive combination scheme and has a side length of 0.55 m(Fig. 1). It features a direct-current(DC) discharge gain length of 60 mm and a capillary diameter of 6 mm. The loss difference between TEM00 and highorder transverse mode(TEM01) is 78×10^(-6), with a 3.24-mm-diameter diaphragm located at the beam waist(Fig. 2). Based on theoretical and experimental investigations on laser plasma dynamics, an optimal He/Ne particle number ratio of 25∶1 is obtained(Fig. 3), in addition to a stable output under a single longitudinal mode with a power of 4 μW and the TEM00(Fig. 4). Observations conducted at 28°N latitude successfully detect stable Earth rotati

关 键 词：世界时测量 大型激光陀螺 激光动力学 NUDT-MRLG550 地球自转 

分 类 号：V241.558[航空宇航科学与技术—飞行器设计]