Ultra-stable transportable ultraviolet clock laser using cancellation between photo-thermal and photo-birefringence noise
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| Format: | Preprint |
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2026
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| _version_ | 1866915977131720704 |
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| author | Kraus, Benjamin Herbers, Sofia Nauk, Constantin Sterr, Uwe Lisdat, Christian Schmidt, Piet O. |
| author_facet | Kraus, Benjamin Herbers, Sofia Nauk, Constantin Sterr, Uwe Lisdat, Christian Schmidt, Piet O. |
| contents | Optical clocks require an ultra-stable laser to probe and precisely measure the frequency of the narrow-linewidth clock transition. We introduce a portable ultraviolet (UV) laser system for use in an aluminum quantum logic clock, demonstrating a fractional frequency instability of approximately $\mathrm{mod}\,σ_\mathrm{y} = 2 \times 10^{-16}$. The system is based on an ultra-stable cavity with crystalline AlGaAs/GaAs mirror coatings, alongside with a frequency quadrupling system employing two single-pass second harmonic generation (SHG) stages. Its acceleration sensitivity, measured in all three axes, does not exceed $4(2) \times 10^{-12}$/(ms$^{-2}$) and is among the lowest recorded for transportable systems to date. Additionally, partial cancellation between photo-thermal noise and photo-birefringence noise is used to effectively mitigate noise induced by intra-cavity optical power fluctuation at lower Fourier frequencies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_02406 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultra-stable transportable ultraviolet clock laser using cancellation between photo-thermal and photo-birefringence noise Kraus, Benjamin Herbers, Sofia Nauk, Constantin Sterr, Uwe Lisdat, Christian Schmidt, Piet O. Optics Quantum Physics Optical clocks require an ultra-stable laser to probe and precisely measure the frequency of the narrow-linewidth clock transition. We introduce a portable ultraviolet (UV) laser system for use in an aluminum quantum logic clock, demonstrating a fractional frequency instability of approximately $\mathrm{mod}\,σ_\mathrm{y} = 2 \times 10^{-16}$. The system is based on an ultra-stable cavity with crystalline AlGaAs/GaAs mirror coatings, alongside with a frequency quadrupling system employing two single-pass second harmonic generation (SHG) stages. Its acceleration sensitivity, measured in all three axes, does not exceed $4(2) \times 10^{-12}$/(ms$^{-2}$) and is among the lowest recorded for transportable systems to date. Additionally, partial cancellation between photo-thermal noise and photo-birefringence noise is used to effectively mitigate noise induced by intra-cavity optical power fluctuation at lower Fourier frequencies. |
| title | Ultra-stable transportable ultraviolet clock laser using cancellation between photo-thermal and photo-birefringence noise |
| topic | Optics Quantum Physics |
| url | https://arxiv.org/abs/2605.02406 |