基于模数混合控制方法的633 nm碘稳频激光器  

633 nm Iodine-Stabilized Laser Based on Analog-Digital Hybrid Control Method

作　　者：邹金澎 殷聪[1] 王建波[1] 毕文文 张明宇[1] 朱怡轩 Zou Jinpeng;Yin Cong;Wang Jianbo;Bi Wenwen;Zhang Mingyu;Zhu Yixuan(Division of Dimensional Metrology,National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量科学研究院几何量计量科学研究所,北京100029

出　　处：《中国激光》2024年第17期96-104,共9页Chinese Journal of Lasers

基　　金：国家重点研发计划青年科学家项目(2021YFF0603300);中国计量科学研究院基本科研业务费重点领域项目(AKYZD2105)。

摘　　要：为满足数字计量时代对长度计量基准器智能化、数字化及高稳定性的需求,报道了一种基于模数混合控制方法的633 nm碘稳频He-Ne激光器,解决了当前基于数字控制系统的碘稳频激光器精度受限、价格昂贵和频率稳定度较低及基于模拟控制系统的碘稳频激光器智能化和数字化水平不足等问题。该系统使用主流微控制器作为控制核心,结合主要由模拟电路构成的调制、解调和比例-积分-微分(PID)锁定部分,实现了633 nm碘稳频He-Ne激光器饱和吸收峰的自动识别和锁定以及碘吸收室高精度控温等功能。实验结果显示,该激光器不仅具备基于数字控制系统的激光器的智能化程度高的优点,可自动识别并锁定设定吸收峰,而且兼具基于模拟控制系统的激光器的精度高的优点,1 s频率稳定度达到1.4×10^(-11),10~3 s稳定度达到3.1×10^(-13)。Objective Based on the principle of iodine molecule saturation absorption for frequency stabilization,the 633-nm He-Ne laser holds considerable application value in geometric metrology,precision interferometric measurements,atomic spectroscopy,and gravity measurements.Recently,digital metrology has emerged as the future direction of metrology.Although 633-nm iodine-stabilized He-Ne lasers based on analog control systems offer high frequency stability and cost-effectiveness,their further development is constrained by limitations in intelligence and digitization levels.The 633-nm iodine-stabilized He-Ne laser,which is based on a digital control system,not only satisfies the demands of digitization but is also more suitable for miniaturization.However,due to the precision limitations of the employed analog-digital(AD)and digital-analog(DA)converters,the frequency stabilization performance of the 633-nm iodine-stabilized He-Ne laser based on digital circuits is often less ideal,with frequency stability typically lower than that of iodine-stabilized He-Ne lasers based on purely analog control systems.To address the aforementioned issues,in this study,a 633-nm iodine-stabilized laser is proposed based on a modulo-mixed control approach.It combines the advantages of high levels of digitization and stability.Methods The structure of the laser system is depicted in Fig.1.The laser comprises two main components:the laser head and control system.The laser head incorporates a self-developed high-power iodine-stabilized He-Ne laser head,comprising a laser tube,iodine cell,high-reflectivity mirror,piezoelectric ceramic,photodetector,and thermoelectric cooling element.The control system consists of two parts:analog circuitry and digital circuitry.The analog circuitry section consists of three parts:a sinusoidal signal generator,an optical power signal demodulator,and a proportional-integral-differential(PID)controller.The sinusoidal signal generator employs a Wien bridge sinusoidal signal generation circuit.By selecting low-tem

关 键 词：激光器 碘稳频激光器 模数混合控制 自动化 

分 类 号：TN242[电子电信—物理电子学] TN248.2TN249