单囚禁离子暗态的光频分析
Optical frequency analysis on dark state of a single trapped ion
摘要：
我们演示了一个光学频率分析方法，使用傅里叶变换的检测时间的荧光光子发射从一个单一的捕获40 Ca+离子。探测到的光子率的相对激光频率偏差的响应记录在一个暗共振的斜率内形成的两个光学偶极跃迁对应的DVDA型能级计划。这种方法增强了对小频率偏差的灵敏度，并且这样做与荧光速率的倒数相关。所采用的激光器被锁相到光学频率梳，这允许通过相对于参考光束确定性地调制所分析的激光束来精确校准光学频率分析。可达到的高信噪比高达MHz范围的调制偏差和高达100 kHz的调制频率的承诺，在广泛的光学光谱应用的适用性所提出的结果。
英文摘要：
We demonstrate an optical frequency analysis method using the Fourier transform of detection times of fluorescence photons emitted from a single trapped 40Ca+ ion. The response of the detected photon rate to the relative laser frequency deviations is recorded within the slope of a dark resonance formed in the lambda-type energy level scheme corresponding to two optical dipole transitions. This approach enhances the sensitivity to the small frequency deviations and does so with reciprocal dependence on the fluorescence rate. The employed lasers are phase locked to an optical frequency comb, which allows for precise calibration of optical frequency analysis by deterministic modulation of the analyzed laser beam with respect to the reference beam. The attainable high signal-to-noise ratios of up to a MHz range of modulation deviations and up to a hundred kHz modulation frequencies promise the applicability of the presented results in a broad range of optical spectroscopic applications.
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