宇航计测技术 ›› 2024, Vol. 44 ›› Issue (5): 50-54.doi: 10.12060/j.issn.1000-7202.2024.05.08

• 量值传递技术 • 上一篇    下一篇

基于长条形漫反射激光冷却原子的光频标

关笑蕾1，张佳1，高勋1，王宇2，史田田3,*，陈景标1,4   

  1. 1.区域光纤通信网与新型光通信系统国家重点实验室，量子电子学研究所，电子学院，北京大学，北京 100871；
    2.计量与校准技术重点实验室，北京长城计量测试技术研究所，北京 100095；
    3.微米/纳米加工技术国家级重点实验室，集成电路学院，北京大学，北京 100871；
    4.合肥国家实验室，合肥 230088
  • 出版日期:2024-10-15 发布日期:2024-11-11
  • 作者简介:关笑蕾（1996-），女，博士研究生在读，主要研究方向：主动光钟及超稳激光技术。
  • 基金资助:
    科技创新2030“量子通信与量子计算机”重大项目（2021ZD0303200）；中国博士后科学基金项目（BX2021020）；计量与校准技术实验室基金（JLJK2023001B001）资助。

Cold-atom Optical Frequency Standard Based on Long-strip Diffuse Laser Cooling

GUAN Xiaolei1,ZHANG Jia1,GAO Xun1,WANG Yu2,SHI Tiantian3,*,CHEN Jingbiao1,4   

  1. 1.State Key Laboratory of Advanced Optical Communication Systems and Networks,Institute of Quantum Electronics,School of Electronics,Peking University,Beijing 100871,China;
    2.National Key Laboratory for Metrology and Calibration Techniques,Changcheng Institute of Metrology & Measurement,Beijing 100095,China;
    3.National Key Laboratory of Advanced Micro and Nano Manufacture Technology,School of Integrated Circuits,Peking University,Beijing 100871,China;
    4.Hefei National Laboratory,Hefei 230088,China
  • Online:2024-10-15 Published:2024-11-11

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摘要： 基于亚多普勒激光光谱技术稳频的光频标已经在不同的原子、分子系综中实现了优于10-13量级的短期频率稳定度。但是，受限于多普勒频移和碰撞频移的影响，现有热原子光频标的长期频率稳定度很难进一步提高。为解决这一问题，一种基于长条形漫反射激光冷却原子的光频标被提出。其创新性地将冷原子与频率调制谱稳频(Frequency modulation spectroscopy，FMS)技术相结合，利用漫反射激光冷却技术制备长达50 cm的冷原子团，显著增加有效原子数目。通过探测冷原子频率调制谱，并将780 nm外腔半导体激光器的输出频率锁定在87Rb 52S1/2（F=2）→52P3/2（F=3）循环跃迁，冷原子光频标最终实现了5×10-15/τ的环内短期频率稳定度。未来，该冷原子光频标有望被发展成为空间冷原子钟或波长标准，推动精密测量领域的不断进步。

关键词: 光频标, 漫反射, 频率调制光谱术

Abstract: Optical frequency standards stabilized by sub-Doppler laser spectroscopy have achieved short-term frequency stability better than 10-13 level in different atomic and molecular ensembles.However,further improvement in the long-term frequency stability of existing thermal-atom optical frequency standards is challenging due to the influence of collision and Doppler frequency shifts.To address this issue,a cold-atom optical frequency standard based on long-strip diffuse laser cooling is proposed.It innovatively combines cold atoms with the frequency modulation spectroscopy (FMS) stabilization technique,and uses diffuse laser cooling to prepare cold atomic cloud up to 50 cm in length,which significantly increases the number of effective atoms.By probing the cold-atom FMS and locking the output frequency of a 780 nm external cavity diode laser to the 87Rb 52S1/2（F=2）→52P3/2（F=3） cycling transition,the cold-atom optical frequency standard ultimately achieves an in-loop short-term frequency stability of 5×10-15/τ.In the future,this cold-atom optical frequency standard is expected to be developed into a space cold-atom clock or a wavelength standard,promoting continuous progress in the field of precision measurement.

Key words: Optical frequency standard, Diffuse reflection, Frequency Modulation Spectroscopy(FMS)

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