Transportable interrogation laser system with an instability of mod σ_y = 3 × 10⁻¹⁶

verfasst von

Sebastian Häfner, Sofia Herbers, Stefan Vogt, Christian Lisdat, Uwe Sterr

Abstract

We present an interrogation laser system for a transportable strontium lattice clock operating at 698 nm, which is based on an ultra-low-expansion glass reference cavity. Transportability is achieved by implementing a rigid, compact, and vibration insensitive mounting of the 12 cm-long reference cavity, sustaining shocks of up to 50 g. The cavity is mounted at optimized support points that independently constrain all degrees of freedom. This mounting concept is especially beneficial for cavities with a ratio of length L over diameter D L/D > 1. Generally, large L helps to reduce thermal noise-induced laser frequency instability while small D leads to small cavity volume. The frequency instability was evaluated, reaching its thermal noise floor of mod σ_y ≈ 3 × 10⁻¹⁶ for averaging times between 0.5 s and 10 s. The laser system was successfully operated during several field studies.

Externe Organisation(en)

Physikalisch-Technische Bundesanstalt (PTB)
nanoplus Nanosystems and Technologies GmbH
Coherent LaserSystems

Typ

Artikel

Journal

Optics express

Band

28

Seiten

16407-16416

Anzahl der Seiten

10

ISSN

1094-4087

Publikationsdatum

25.05.2020

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Atom- und Molekularphysik sowie Optik

Elektronische Version(en)

https://doi.org/10.1364/OE.390105 (Zugang: Offen)