Portable Laser-Pumped Rb Atomic Clock with Digital Circuits
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911110901268480 |
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| author | Hao, Qiang Yang, Shaojie Yun, Peter Ruan, Jun Zhang, Shougang |
| author_facet | Hao, Qiang Yang, Shaojie Yun, Peter Ruan, Jun Zhang, Shougang |
| contents | Reducing the size and complexity of high-performance timekeeping devices is an ever-growing need for various applications, such as 6G wireless technology, positioning, navigation and timing (PNT), Internet of Things (IoT), and ultrafast spectroscopy. This work presents a distributed feedback (DFB) laser-pumped Rb atomic clock, which features extraordinary frequency stability, small size and low power consumption. The DFB laser head employs a built-in isolator with a linewidth of approximately 1 MHz. For complete optical pumping of the atoms in the absorption cell, the laser beam is expanded to a diameter of 10 mm by using an optical diffuser-based beam expander. The physics package is based on a magnetron microwave cavity and surrounded by two layers of magnetic shielding. The overall volume of the optical system combined with the physics package is 250 cm$^3$. The proposed atomic clock is also designed to operate at a low temperature, whose absorption cell is maintained at 323 K. Benefiting from the lower Rb atom density, the excited atoms present a long population relaxation time of 5.8 ms. The frequency synthesizer and frequency-locked loop are implemented by digital circuits. The short-term stability of the atomic clock is measured to be $1.8\times10^{-12}τ^{-1/2}$ (1-100s). Our achievement paves the way for practical application of the laser-pumped Rb atomic clocks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_12437 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Portable Laser-Pumped Rb Atomic Clock with Digital Circuits Hao, Qiang Yang, Shaojie Yun, Peter Ruan, Jun Zhang, Shougang Atomic Physics Quantum Physics Reducing the size and complexity of high-performance timekeeping devices is an ever-growing need for various applications, such as 6G wireless technology, positioning, navigation and timing (PNT), Internet of Things (IoT), and ultrafast spectroscopy. This work presents a distributed feedback (DFB) laser-pumped Rb atomic clock, which features extraordinary frequency stability, small size and low power consumption. The DFB laser head employs a built-in isolator with a linewidth of approximately 1 MHz. For complete optical pumping of the atoms in the absorption cell, the laser beam is expanded to a diameter of 10 mm by using an optical diffuser-based beam expander. The physics package is based on a magnetron microwave cavity and surrounded by two layers of magnetic shielding. The overall volume of the optical system combined with the physics package is 250 cm$^3$. The proposed atomic clock is also designed to operate at a low temperature, whose absorption cell is maintained at 323 K. Benefiting from the lower Rb atom density, the excited atoms present a long population relaxation time of 5.8 ms. The frequency synthesizer and frequency-locked loop are implemented by digital circuits. The short-term stability of the atomic clock is measured to be $1.8\times10^{-12}τ^{-1/2}$ (1-100s). Our achievement paves the way for practical application of the laser-pumped Rb atomic clocks. |
| title | Portable Laser-Pumped Rb Atomic Clock with Digital Circuits |
| topic | Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2508.12437 |