Coherent photo-thermal noise cancellation in a dual-wavelength optical cavity for narrow-linewidth laser frequency stabilisation

authored by: Fabian Dawel, Alexander Wilzewski, Sofia Herbers, Lennart Pelzer, Johannes Kramer, Marek B. Hild, Kai Dietze, Ludwig Krinner, Nicolas C.H. Spethmann, Piet O. Schmidt
Abstract: Optical resonators are used for the realisation of ultra-stable frequency lasers. The use of high reflectivity multi-band coatings allows the frequency locking of several lasers of different wavelengths to a single cavity. While the noise processes for single wavelength cavities are well known, the correlation caused by multi-stack coatings has as yet not been analysed experimentally. In our work, we stabilise the frequency of a 729 nm and a 1069 nm laser to one mirror pair and determine the residual-amplitude modulation (RAM) and photo-thermal noise (PTN). We find correlations in PTN between the two lasers and observe coherent cancellation of PTN for the 1069 nm coating. We show that the fractional frequency instability of the 729 nm laser is limited by RAM at 1 × 10⁻¹⁴. The instability of the 1069 nm laser is at 3 × 10⁻¹⁵ close to the thermal noise limit of 1.5
Organisation(s): Institute of Quantum Optics
QuantumFrontiers
CRC 1464: Relativistic and Quantum-Based Geodesy (TerraQ)
External Organisation(s): National Metrology Institute of Germany (PTB)
Type: Article
Journal: Optics express
Volume: 32
Pages: 7276-7288
No. of pages: 13
ISSN: 1094-4087
Publication date: 14.02.2024
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Atomic and Molecular Physics, and Optics
Electronic version(s): https://doi.org/10.48550/arXiv.2311.11610 (Access: Open)
https://doi.org/10.1364/OE.516433 (Access: Open)

BibTeX

@article{88bebba59f584379ac2cc807265fffff,
title = "Coherent photo-thermal noise cancellation in a dual-wavelength optical cavity for narrow-linewidth laser frequency stabilisation",
abstract = "Optical resonators are used for the realisation of ultra-stable frequency lasers. The use of high reflectivity multi-band coatings allows the frequency locking of several lasers of different wavelengths to a single cavity. While the noise processes for single wavelength cavities are well known, the correlation caused by multi-stack coatings has as yet not been analysed experimentally. In our work, we stabilise the frequency of a 729 nm and a 1069 nm laser to one mirror pair and determine the residual-amplitude modulation (RAM) and photo-thermal noise (PTN). We find correlations in PTN between the two lasers and observe coherent cancellation of PTN for the 1069 nm coating. We show that the fractional frequency instability of the 729 nm laser is limited by RAM at 1 × 10−14. The instability of the 1069 nm laser is at 3 × 10−15 close to the thermal noise limit of 1.5",
author = "Fabian Dawel and Alexander Wilzewski and Sofia Herbers and Lennart Pelzer and Johannes Kramer and Hild, {Marek B.} and Kai Dietze and Ludwig Krinner and Spethmann, {Nicolas C.H.} and Schmidt, {Piet O.}",
note = "Funding Information: Funding. Deutsche Forschungsgemeinschaft (EXC-2123 QuantumFrontiers - 390837967, SFB 1227, project B03 - 274200144, SFB 1464 TerraQ, Project-ID 434617780, and Project-ID 366146996); European Metrology Programme for Innovation and Research; Horizon 2020 Framework Programme research and innovation programme (20FUN01 TSCAC); European Research Council (101019987); State of Lower Saxony through Nieders{\"a}chsisches Vorab (QVLS-Q1). ",
year = "2024",
month = feb,
day = "14",
doi = "10.48550/arXiv.2311.11610",
language = "English",
volume = "32",
pages = "7276--7288",
journal = "Optics express",
issn = "1094-4087",
publisher = "OSA - The Optical Society",
number = "5",
}