Ultra-stable transportable ultraviolet clock laser using cancellation between photo-thermal and photo-birefringence noise
- authored by
- Benjamin Kraus, Sofia Herbers, Constantin Nauk, Uwe Sterr, Christian Lisdat, Piet o. Schmidt
- 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.
- Organisation(s)
-
Institute of Quantum Optics
- External Organisation(s)
-
Physikalisch-Technische Bundesanstalt PTB
- Type
- Article
- Journal
- Optics letters
- Volume
- 50
- Pages
- 658-661
- No. of pages
- 4
- ISSN
- 0146-9592
- Publication date
- 14.01.2025
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Electronic version(s)
-
https://doi.org/10.1364/OL.544907 (Access:
Open)