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报道了建立铟单离子(115In+)光频标实验系统的实验进展。单个离子囚禁在Paul-Straubel型离子阱中,利用激光边带冷却技术将其冷却至最低振动能态。为了探测和测量铟离子参考用跃迁5s21S0-5s5p3P0的频率,使用一台Hz量级超窄线宽激光作为探测激光,用以获得量子跳跃信号。用一台以商用铯原子钟为基准的飞秒光频梳作为测量工具,对其频率进行了20次的精密测量,相对不确定度为5.0×10-14。
The experimental progress of establishing an indium single ion (115In +) optical frequency standard experimental system was reported. Individual ions were trapped in a Paul-Straubel ion trap and cooled to the lowest vibrational state using laser sideband cooling. In order to detect and measure the frequency of the 5s21S0-5s5p3P0 transition for the indium ion reference, an ultra-narrow linewidth laser of the order of magnitude was used as the probe laser to obtain the quantum hopping signal. Using a femtosecond optical frequency comb based on a commercial cesium atomic clock as a measuring tool, the frequency was measured 20 times with a relative uncertainty of 5.0 × 10-14.