Details
Original language | English |
---|---|
Pages (from-to) | 658-661 |
Number of pages | 4 |
Journal | Optics letters |
Volume | 50 |
Issue number | 2 |
Publication status | Published - 14 Jan 2025 |
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 mod σy = 2 × 10-16. The system is based on an ultra-stable cavity with crystalline AlGaAs/GaAs mirror coatings, 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) × 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.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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In: Optics letters, Vol. 50, No. 2, 14.01.2025, p. 658-661.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Ultra-stable transportable ultraviolet clock laser using cancellation between photo-thermal and photo-birefringence noise
AU - Kraus, Benjamin
AU - Herbers, Sofia
AU - Nauk, Constantin
AU - Sterr, Uwe
AU - Lisdat, Christian
AU - Schmidt, Piet o.
PY - 2025/1/14
Y1 - 2025/1/14
N2 - 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 mod σy = 2 × 10-16. The system is based on an ultra-stable cavity with crystalline AlGaAs/GaAs mirror coatings, 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) × 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.
AB - 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 mod σy = 2 × 10-16. The system is based on an ultra-stable cavity with crystalline AlGaAs/GaAs mirror coatings, 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) × 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.
UR - http://www.scopus.com/inward/record.url?scp=85215967615&partnerID=8YFLogxK
U2 - 10.1364/OL.544907
DO - 10.1364/OL.544907
M3 - Article
VL - 50
SP - 658
EP - 661
JO - Optics letters
JF - Optics letters
SN - 0146-9592
IS - 2
ER -