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利用Zemax软件为线形离子阱囚禁199 Hg+实验设计了一套光学系统,该系统包括两部分,即光学激发系统和荧光收集系统。光学激发系统由202 H g无极谱灯和激发透镜组组成。激发透镜组将202 Hg无极谱灯的直径为15 mm的圆形面光源整形成23 mm ×4 mm的矩形光去激发199 H g+能级跃迁,从而使其辐射出荧光,再利用荧光收集系统去收集该荧光。荧光收集系统由收集透镜组、滤波片和光电倍增管组成。设计结果表明:该收集透镜组可以很好地将荧光发光面成像在直径为23 m m的光电倍增管上,具有较高的荧光收集效率,约3%。经物理系统实验,结果表明,该光学系统满足实验要求且具有较高的信噪比,其值约为20。这为高性能线形199 H g+微波频标的工程应用提供了基础。 相似文献
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Comparison experiments of neon and helium buffer gases cooling in trapped ~(199)Hg~+ ions linear trap 下载免费PDF全文
The influences of different buffer gas, neon and helium, on199Hg+clock transition are compared in trapped199Hg+linear trap. By the technique of time domain’s Ramsey separated oscillatory fields, the buffer gas pressure frequency shifts of199Hg+clock transition are measured to be(d f /dPNe)(1/ f) = 1.8 × 10-8Torr-1for neon and(d f /dPHe)(1/ f) = 9.1 × 10-8Torr-1for helium. Meanwhile, the line-width of199Hg+clock transition spectrum with the buffer gas neon is narrower than that with helium at the same pressure. These experimental results show that neon is a more suitable buffer gas than helium in199Hg+ions microwave frequency standards because of the199Hg+clock transition is less sensitive to neon variations and the better cooling effect of neon. The optimum operating pressure for neon is found to be about 1.0 × 10-5Torr in our linear ion trap system. 相似文献
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Evaluation of the frequency instability limited by Dick effect in the microwave ~(199)Hg~+ trapped-ion clock 下载免费PDF全文
In the microwave ~(199)Hg~+ trapped-ion clock, the frequency instability degradation caused by the Dick effect is unavoidable because of the periodical interrogating field. In this paper, the general expression of the sensitivity function g(t)to the frequency fluctuation of the interrogating field with Nπ-pulse(N is odd) is derived. According to the measured phase noise of the 40.5-GHz microwave synthesizer, the Dick-effect limited Allan deviation of our ~(199)Hg~+ trapped-ion clock is worked out. The results indicate that the limited Allan deviations are about 1.75 × 10~(-13)τ~(1/2) and 3.03 × 10~(-13)τ~(1/2) respectively in the linear ion trap and in the two-segment extended linear ion trap under our present experimental parameters. 相似文献
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在原有射频扫幅抛出检测方法的基础上,通过恒定射频场幅度仅增加直流电场幅度的方法实现了Paul阱中离子的抛出.采用的直流抛出方法成功地对囚禁在Paul阱中199Hg+离子进行了检测,并克服了射频扫幅抛出检测方法采集大质量数离子的信号的线性、精度、稳定度不理想的缺陷,采集到信号的信噪比较高,达到了100以上,这为获得囚禁离子的各种动力学参数提供了较好的实验数据. 相似文献
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Microwave-Optical Double-Resonance Spectroscopy Experiment of 199Hg+ Ground State Hyperfine Splitting in a Linear Ion Trap 下载免费PDF全文
We report a spectroscopy experiment of the ^199Hg+ ions are optically pumped by a discharge lamp and splitting is measured to be 40507347996.8(0.1)Hz by line width as 30mHz is also observed. This progress ion frequency standards. ground state hyperfine splitting in a linear ion trap. The cooled by helium buffer gas. The ground state hyperfine the mierowave-optical double-resonance method. A nsrrow builds the foundation for the realization of trapped ^199Hg+ 相似文献
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