1. Atom-referenced on-chip soliton microcomb
- Author
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Niu, Rui, Wan, Shuai, Hua, Tian-Peng, Wang, Wei-Qiang, Wang, Zheng-Yu, Li, Jin, Wang, Zhu-Bo, Li, Ming, Shen, Zhen, Sun, Y. R., Hu, Shui-Ming, Little, B. E., Chu, S. T., Zhao, Wei, Guo, Guang-Can, Zou, Chang-Ling, Xiao, Yun-Feng, Zhang, Wen-Fu, and Dong, Chun-Hua
- Subjects
Physics - Optics ,Physics - Instrumentation and Detectors - Abstract
For the applications of the frequency comb in microresonators, it is essential to obtain a fully frequency-stabilized microcomb laser source. Here, we demonstrate an atom-referenced stabilized soliton microcomb generation system based on the integrated microring resonator. The pump light around $1560.48\,\mathrm{nm}$ locked to an ultra-low-expansion (ULE) cavity, is frequency-doubled and referenced to the atomic transition of $^{87}\mathrm{Rb}$. The repetition rate of the soliton microcomb is injection-locked to an atomic-clock-stabilized radio frequency (RF) source, leading to mHz stabilization at $1$ seconds. As a result, all comb lines have been frequency-stabilized based on the atomic reference and could be determined with very high precision reaching $\sim18\,\mathrm{Hz}$ at 1 second, corresponding to the frequency stability of $9.5\times10^{-14}$. Our approach provides an integrated and fully stabilized microcomb experiment scheme with no requirement of $f-2f$ technique, which could be easily implemented and generalized to various photonic platforms, thus paving the way towards the portable and ultraprecise optical sources for high precision spectroscopy., Comment: 7 pages, 8 figures
- Published
- 2023