星载汞离子微波钟射频无极灯折射透镜仿真设计  

Refractive Lenses Stimulation Design for Electrodeless Lamp of Hg^+ Ion Atomic Clock

作　　者：辛弄潮 蒙艳松[1] 张荣彦[1] 杜丽君 XIN Nongchao;MENG Yansong;ZHANG Rongyan;DU Lijun(China Academy of Space Technology(Xi’an),Xi’an 710000,China)

机构地区：[1]中国空间技术研究院西安分院,西安710000

出　　处：《空间电子技术》2018年第5期22-26,34,共6页Space Electronic Technology

基　　金：陕西省重点研发计划项目(2016MSZD-G-10-11)

摘　　要：汞离子微波钟以其预期可见的优良性能和高可靠性,成为下一代星载时钟的研究热点。星载汞离子微波钟利用射频离子无极灯发出的194nm深紫外光进行量子态制备和态检测,但受汞离子微波钟四极阱的结构限制,需在光束入射四极阱前,将入射光面由圆形整变为矩形。针对此问题,文章利用ZEMAX软件设计折射透镜组,将波长194nm、直径4mm的圆光斑整形为2mm×20mm的矩形光斑。与其他原子钟和离子钟光束整形系统不同的是,在完成光斑尺寸变形的基础上,考虑到汞离子微波钟的泵浦效率,要求整形光斑光强尽量呈均匀分布。因此,额外利用光场分布法设计透镜组,将光强重新分布,得到均匀分布的矩形光斑。仿真结果显示,矩形光斑分布均匀,光强均匀度达73. 52%,外形尺寸满足设计要求。分析表明,波长偏移对光强均匀度有一定影响,光学系统的装配精度对光学系统的波前差有较大影响。Due to expected decent performance and reliability,Hg+ion microwave atomic clock has been a research hotspot on spaceborne clock.In order to accomplish quantum state preparation and detection,spaceborne Hg+ion atomic clock uses electrodeless lamp to give off deep UV 194 nm.Due to occlusion of ion trap structure,before beam arrives at ion trap,incident beam is supposed to form rectangular spot.ZEMAX software is used to design refractive lenses to transform round spot with 4mm diameter into rectangular spot,with 2mm width and 20mm length.Comparing with other atom or ion clock,based on accomplishment of spot size distortion and considering pumping efficiency of electrodeless lamp,beam distribution way is used to redistribute intensity and obtain uniform rectangular spot.Stimulation result shows that intensity distribution of rectangular spot is even,intensity uniformity is about 73.52%,and size meets design requirements.According to analysis,wavelength deviation has influence on intensity uniformity and assembly accuracy is crucial to wavefront of the whole optical system.

关 键 词：光学设计 透镜系统设计 高斯光束 汞离子微波钟 ZEMAX仿真设计 

分 类 号：TN249[电子电信—物理电子学]