基于$^{229}$Th VUV吸收光谱的固态核时钟
A solid-state nuclear clock based on VUV absorption spectroscopy of $^{229}$Th
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- Hefei National Laboratory, University of Science and Technology of China（中国科学技术大学合肥国家实验室）
- School of Physical Sciences, University of Science and Technology of China（中国科学技术大学物理学院）
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中文总结 AI 辅助
本文演示了基于$^{229}$Th:CaF$_2$晶体VUV吸收的固态核时钟持续运行，分辨四极分量并实现30小时稳定反馈，频率不稳定性达$10^{-13}$量级。
中文摘要 AI 辅助
我们演示了使用148.4 nm连续波吸收的固态钍-229核时钟的持续运行。在$^{229}\mathrm{Th}:\mathrm{CaF}_2$晶体中，我们分辨出D中心的四个四极分量和一个更宽的O中心共振。对最强窄分量的反馈大约每10秒更新一次，并在整个30小时的记录中保持活跃。氢钟参考的频率梳测量输出。其分数频率不稳定性约为$1.29\times10^{-11}(\tau/\mathrm{s})^{-1/2}$，在$10^4$秒时达到$1.24\times10^{-13}$。另一次6.6小时的运行演示了对第二个四极分量的反馈。这些测量将分辨的吸收光谱与持续的核时钟运行以及晶体段之间的频率比较联系起来。
英文摘要
We demonstrate sustained operation of a solid-state thorium-229 nuclear clock using continuous-wave absorption at 148.4 nm. In a $^{229}\mathrm{Th}:\mathrm{CaF}_2$ crystal, we resolve four quadrupole components of the D center and a broader O-center resonance. Feedback on the strongest narrow component is updated approximately every 10 s and remains active throughout a 30-h record. A hydrogen-maser-referenced frequency comb measures the output. Its fractional frequency instability follows approximately $1.29\times10^{-11}(τ/\mathrm{s})^{-1/2}$ and reaches $1.24\times10^{-13}$ at $10^4$ s. A separate 6.6-h run demonstrates feedback on a second quadrupole component. These measurements connect the resolved absorption spectra with sustained nuclear-clock operation and frequency comparisons between crystal segments.
