Ultra-stable transportable ultraviolet clock laser using cancellation between photo-thermal and photo-birefringence noise

• URL: http://arxiv.org/abs/2605.02406v1
• Date: Mon, 04 May 2026 09:50:42 GMT
• Title: Ultra-stable transportable ultraviolet clock laser using cancellation between photo-thermal and photo-birefringence noise
• Abstract summary: Optical clocks require an ultra-stable laser to probe and precisely measure the frequency of the narrow-linewidth clock transition.<n>We introduce a portable ultraviolet (UV) laser system for use in an aluminum quantum logic clock.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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