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Indium single-ion optical frequency standard

机译:铟单离子光学频率标准

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Single laser-cooled ions in radiofrequency traps can serve as the basis for highly stable optical frequency standards. Here we present recent results on In~+, using the ~1S_0 -> ~3P_0 line at 236.5 nm wavelength as the clock transition. This resonance has a natural linewidth of only 0.82 Hz and systematic shifts should be controllable at the mHz level. A single indium ion is stored in a miniature Paul-Straubel trap and laser cooled to a temperature of about 100 mu K. The clock transition is excited using a frequency quadrupled 946 nm Nd:YAG laser. A fractional resolution of 1.3 centre dot 10~(-13) has been achieved so far (linewidth of 170 Hz at 1267 THz). The absolute optical frequency of the clock transition has been measured with an uncertainty being less than 3 centre dot l0~(-13) using a frequency chain and a methane-stabilized HeNe laser that was calibrated with a cesium dock.
机译:射频阱中的单个激光冷却离子可作为高度稳定的光学频率标准的基础。在这里,我们使用在236.5 nm波长处的〜1S_0->〜3P_0线作为时钟转换,介绍了In〜+上的最新结果。该谐振的自然线宽仅为0.82 Hz,系统偏移应可控制在mHz级别。将单个铟离子存储在微型Paul-Straubel阱中,并激光冷却至约100μK的温度。使用四倍频的946 nm Nd:YAG激光器激发时钟跃迁。到目前为止,已经实现了1.3个中心点10〜(-13)的分数分辨率(在1267 THz时线宽为170 Hz)。已使用频率链和经铯基座校准的甲烷稳定的氦氖激光器对时钟过渡的绝对光频率进行了测量,其不确定度小于3个中心点l0〜(-13)。

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