Compact 780 nm Rb Optical Clock
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866910844927868928 |
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| author | Chen, Zhendong Liu, Tianyu Yang, Qiaohui Wang, Ya Miao, Jie Chen, Jingming Pan, Duo Yang, Ruoao Wu, Jianjun Zhang, Zhigang Chen, Jingbiao |
| author_facet | Chen, Zhendong Liu, Tianyu Yang, Qiaohui Wang, Ya Miao, Jie Chen, Jingming Pan, Duo Yang, Ruoao Wu, Jianjun Zhang, Zhigang Chen, Jingbiao |
| contents | We demonstrated a compact 780 nm rubidium optical clock, which includes an optical frequency standard and an optical frequency comb, with an optical volume of 11.6 liters. Unlike the 778 nm rubidium atomic clocks based on two-photon transition, here, the laser frequency is stabilized to the Rb D2 transition, using modulation transfer spectroscopy. This approach effectively eliminates Doppler background and provides a high signal to noise ratio and high sensitivity. A nearly 300 MHz microwave signal, whose phase exactly tracks that of the optical frequency standard, is generated via the optical frequency comb, yielding a frequency instability of 1.91 E-13 @1 s and 5.29 E-14 @1000 s in the electronic domain. To the best of our knowledge, this is the most precise frequency stabilization result for the first-excited-state transition of alkali metal atoms to date and represents the first optical clock based on this transition. These results offer a promising approach for the development of portable optical clocks. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_01826 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Compact 780 nm Rb Optical Clock Chen, Zhendong Liu, Tianyu Yang, Qiaohui Wang, Ya Miao, Jie Chen, Jingming Pan, Duo Yang, Ruoao Wu, Jianjun Zhang, Zhigang Chen, Jingbiao Optics Atomic Physics 14J60 F.2.2; I.2.7 We demonstrated a compact 780 nm rubidium optical clock, which includes an optical frequency standard and an optical frequency comb, with an optical volume of 11.6 liters. Unlike the 778 nm rubidium atomic clocks based on two-photon transition, here, the laser frequency is stabilized to the Rb D2 transition, using modulation transfer spectroscopy. This approach effectively eliminates Doppler background and provides a high signal to noise ratio and high sensitivity. A nearly 300 MHz microwave signal, whose phase exactly tracks that of the optical frequency standard, is generated via the optical frequency comb, yielding a frequency instability of 1.91 E-13 @1 s and 5.29 E-14 @1000 s in the electronic domain. To the best of our knowledge, this is the most precise frequency stabilization result for the first-excited-state transition of alkali metal atoms to date and represents the first optical clock based on this transition. These results offer a promising approach for the development of portable optical clocks. |
| title | Compact 780 nm Rb Optical Clock |
| topic | Optics Atomic Physics 14J60 F.2.2; I.2.7 |
| url | https://arxiv.org/abs/2501.01826 |