Centi-combs: Low-noise sub-GHz repetition-rate soliton frequency combs from crystalline resonators
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866917384438153216 |
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| author | Murakami, Tatsuki Ogawa, Keisuke Kumazaki, Hajime Fujii, Shun |
| author_facet | Murakami, Tatsuki Ogawa, Keisuke Kumazaki, Hajime Fujii, Shun |
| contents | We demonstrate low-noise Kerr soliton frequency combs with repetition rates below 1~GHz in ultrahigh-Q crystalline magnesium fluoride resonators. Single soliton states with repetition rates of 0.90 GHz, 1.19 GHz, 1.59 GHz, 2.48 GHz, and 4.10 GHz are observed with continuous-wave laser excitation. The near-GHz soliton repetition frequency exhibits a single-sideband phase noise of -137 dBc/Hz at a 100 kHz offset, surpassing state-of-the-art microwave generators. These ``centi-combs'' bridge the gap between conventional mode-locked lasers and microresonator frequency combs, providing a new route towards real-time sampling, optical-to-microwave synchronization, and hybrid optical clock networks in a compact form. This work expands the operational range of Kerr soliton microcombs from the terahertz to the sub-gigahertz domain, opening new frontiers for frequency comb technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_21132 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Centi-combs: Low-noise sub-GHz repetition-rate soliton frequency combs from crystalline resonators Murakami, Tatsuki Ogawa, Keisuke Kumazaki, Hajime Fujii, Shun Optics Applied Physics We demonstrate low-noise Kerr soliton frequency combs with repetition rates below 1~GHz in ultrahigh-Q crystalline magnesium fluoride resonators. Single soliton states with repetition rates of 0.90 GHz, 1.19 GHz, 1.59 GHz, 2.48 GHz, and 4.10 GHz are observed with continuous-wave laser excitation. The near-GHz soliton repetition frequency exhibits a single-sideband phase noise of -137 dBc/Hz at a 100 kHz offset, surpassing state-of-the-art microwave generators. These ``centi-combs'' bridge the gap between conventional mode-locked lasers and microresonator frequency combs, providing a new route towards real-time sampling, optical-to-microwave synchronization, and hybrid optical clock networks in a compact form. This work expands the operational range of Kerr soliton microcombs from the terahertz to the sub-gigahertz domain, opening new frontiers for frequency comb technologies. |
| title | Centi-combs: Low-noise sub-GHz repetition-rate soliton frequency combs from crystalline resonators |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2510.21132 |