面向Rb原子精密测量的边带锁定780 nm高功率激光源  

Sideband-Locked High-Power 780 nm Laser Source for Precise Measurement Based on Rb Atoms

作　　者：魏珊珊 刘元煌 陈群峰 姚波 张骥 周林 毛庆和 Wei Shanshan;Liu Yuanhuang;Chen Qunfeng;Yao Bo;Zhang Ji;Zhou Lin;Mao Qinghe(School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China,Hefei,Anhui 230026,China;Anhui Provincial Key Laboratory of Photonics Devices and Materials,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei,Anhui 230031,China;Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan,Hubei 430071,China)

机构地区：[1]中国科学技术大学环境科学与光电技术学院,安徽合肥230026 [2]中国科学院安徽光学精密机械研究所光子器件与材料安徽省重点实验室,安徽合肥230031 [3]中国科学院精密测量科学与技术创新研究院,湖北武汉430071

出　　处：《中国激光》2021年第7期48-56,共9页Chinese Journal of Lasers

基　　金：国家重点研发计划(2017YFB0405100,2017YFB0405200);中国科学院战略性先导科技专项B类(XDB21010300);国家自然科学基金(61805258,61377044);先进激光技术安徽省实验室主任基金(20191001)。

摘　　要：报道一种自主设计研制的面向Rb原子精密测量应用的780 nm高功率激光源样机。该样机采用线偏振、窄线宽且频率可宽带调谐的单个1560 nm光纤激光器作为种子源,通过有效提升光纤放大器的输出功率,经PPLN倍频产生的780 nm激光功率高达2.25 W。采用边带锁定的饱和吸收稳频技术,高功率780 nm激光中心频率可长期稳定在±150 kHz以内,且可精确调谐1.2 GHz,线偏振度高达23 dB。该样机操作方便、可搬运,非常适合于Rb原子的精密测量应用。Objective Because of the important applications of Rb atoms in precision measurement,the linearly polarized,narrow-linewidth,and frequency-stable 780 nm laser source which matches the D2 transition line of Rb atoms has recently begun to attract more attention.The linewidth of the 780 nm laser diode and the 1560 nm laser diode used for the frequency doubling of periodically-poled Lithium Niobate(PPLN)crystal both are in the order of MHz.Although the linewidth of the Ti∶Sapphire laser is as narrow as kHz,it presents its own problems,such as large size,high cost,and difficulty of maintenance and transport,which greatly limit the practical use of high-precision atom interferometers.The 780 nm laser source-realized by the combination of techniques including power amplification of the narrow linewidth 1560 nm fiber by the erbium doped fiber amplifier(EDFA),frequency doubling by the PPLN crystal,and sideband locking,is currently the most promising candidate;however,its maximum power is only 1.2 W,presenting difficulty in meeting the requirements of the above applications.In this paper,a high-power 780 nm laser source prototype of our own design and development,with stable frequency,narrow linewidth,and high linear polarization,is presented.In addition,the cooling,repumping,and atomic interference coherent operation lasers can be simultaneously obtained by this prototype,which is convenient for precise measurement based on super-cold Rb atoms.Methods The 780 nm laser source uses a single 1560 nm fiber laser with linear polarization,narrow linewidth,and broadband tunable frequency as its seed source.After the 1560 nm laser's power is boosted by the EDFA,the polarization-maintaining fiber coupler divides it into two parts.One part is frequency doubled by the waveguide-type PPLN crystal to stabilize the 1560 nm laser's frequency via saturation absorption spectroscopy;by using sideband-locking technology,the sideband frequency of the 780 nm laser is locked to the hyperfine transition of the ^(85)Rb atoms,and a wide range o

关 键 词：激光器 光纤激光器 超冷铷原子 边带锁定 频率调谐 

分 类 号：TN248[电子电信—物理电子学]