新型543 nm波长激光陀螺  

New 543 nm Ring Laser Gyroscope

作　　者：樊振方 张斌[1,2] 吴素勇 赵洪常 穆秋晔 金洋 罗晖[1,2] 谭中奇[1,2] Fan Zhenfang;Zhang Bin;Wu Suyong;Zhao Hongchang;Mu Qiuye;Jin Yang;Luo Hui;Tan Zhongqi(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》2025年第1期1-6,共6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)。

摘　　要：目前,激光陀螺的精度已经接近量子极限,改变陀螺的波长能够探索量子噪声的作用机理,为进一步压缩量子噪声指明方向。本团队选定543 nm谱线作为工作波长,设计了新型激光陀螺。针对543 nm谱线增益较弱的问题,重新设计了谐振腔和反射膜片,实现了543 nm波长的顺利起振,并通过试验研究了气压和气比对输出光强的影响。合光后顺利观测到了Sagnac效应,并实现了4.5×10^(-5)(°)/√h的角度随机游走。Objective In ring laser gyroscopes,the most important error term is the angular random walk.The accuracy of inertial navigation systems is ultimately determined by this error term.For the mechanically dithered ring laser gyroscope,the angular random walk mainly includes random lock-in crossing and quantum noise.Developments in manufacturing techniques,such ultra-smooth surface polishing,are reducing lock-in crossing error and amplifying the significance of quantum noise.Recent studies have demonstrated that the accuracy of high-precision mechanically dithered gyroscopes can nearly achieve quantum noise accuracy.Thus,the next challenge in laser gyroscope research is to compress the quantum noise.From the demonstration of the first laser gyroscopes in the 1960s,most laser gyroscopes operate at a wavelength of 633 nm,owing to the 633 nm spectral line having the largest gain coefficient,compared with its neighboring spectral lines,which facilitates the startup and maintenance of the laser.Hence,a new ring laser gyroscope based on 543 nm is built to discover the relationship between wavelength and quantum noise.The first effect of altering the working wavelength is realized in the variation of scale factor.Moreover,altering the wavelength may result in variations of the number of photons in the resonant cavity,which may alter the quantum noise.Thus,changing the wavelength of the gyroscope can provide information on the mechanism of quantum noise and offer guidance for further quantum noise compression.Methods The 633 nm spectral line is generated by an energy level transition from 3S2 to 2P4,and the 543 nm spectral line is generated by an energy level transition from 3S2 to 2P10.Under identical conditions,the gain of 543 nm is only 1/30 of that of 633 nm.Once the dominant 633 nm spectral line starts lasering,costs are incurred in terms of population inversion resources,which makes it more difficult for other spectral lines to laser.To achieve the selective oscillation of the 543 nm spectral line,the traditional method

关 键 词：激光陀螺 量子噪声 543 nm波长 腔损 

分 类 号：TN249[电子电信—物理电子学]