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

verfasst von

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.

Organisationseinheit(en)

Institut für Quantenoptik

Externe Organisation(en)

Physikalisch-Technische Bundesanstalt (PTB)

Typ

Artikel

Journal

Optics letters

Band

50

Seiten

658-661

Anzahl der Seiten

4

ISSN

0146-9592

Publikationsdatum

14.01.2025

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Atom- und Molekularphysik sowie Optik

Elektronische Version(en)

https://doi.org/10.1364/OL.544907 (Zugang: Offen)