---
_id: '14802'
abstract:
- lang: eng
  text: Frequency-stable lasers form the back bone of precision measurements in science
    and technology. Such lasers typically attain their stability through frequency
    locking to reference cavities. State-of-the-art locking performances to date had
    been achieved using frequency modulation based methods, complemented with active
    drift cancellation systems. We demonstrate an all passive, modulation-free laser-cavity
    locking technique (squash locking) that utilizes changes in spatial beam ellipticity
    for error signal generation, and a coherent polarization post-selection for noise
    resilience. By comparing two identically built proof-of-principle systems, we
    show a frequency locking instability of 5×10<jats:sup>−7</jats:sup> relative to
    the cavity linewidth at 10 s averaging. The results surpass the demonstrated performances
    of methods engineered over the last five decades, potentially enabling an advancement
    in the precision control of lasers, while creating avenues for bridging the performance
    gaps between industrial grade lasers with scientific ones due to the afforded
    simplicity and scalability.
acknowledgement: We thank Rishabh Sahu and Sebastian Wald for technical contributions
  to the experiment. Funding by Institute of Science and Technology Austria.
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Fritz R
  full_name: Diorico, Fritz R
  id: 2E054C4C-F248-11E8-B48F-1D18A9856A87
  last_name: Diorico
  orcid: 0000-0002-4947-8924
- first_name: Artem
  full_name: Zhutov, Artem
  id: 0f02ed6a-b514-11ee-b891-8379c5f19cb7
  last_name: Zhutov
- first_name: Onur
  full_name: Hosten, Onur
  id: 4C02D85E-F248-11E8-B48F-1D18A9856A87
  last_name: Hosten
  orcid: 0000-0002-2031-204X
date_created: 2024-01-15T10:25:38Z
date_published: 2024-01-20T00:00:00Z
date_updated: 2024-08-19T09:52:20Z
day: '20'
ddc:
- '530'
department:
- _id: OnHo
doi: 10.1364/optica.507451
external_id:
  arxiv:
  - '2202.13212'
file:
- access_level: open_access
  checksum: eb99ca7d0fe73e22f121875175546ed7
  content_type: application/pdf
  creator: dernst
  date_created: 2024-01-17T08:53:16Z
  date_updated: 2024-01-17T08:53:16Z
  file_id: '14824'
  file_name: 2023_Optica_Diorico.pdf
  file_size: 4558986
  relation: main_file
  success: 1
file_date_updated: 2024-01-17T08:53:16Z
has_accepted_license: '1'
intvolume: '        11'
issue: '1'
keyword:
- Atomic and Molecular Physics
- and Optics
- Electronic
- Optical and Magnetic Materials
language:
- iso: eng
month: '01'
oa: 1
oa_version: Published Version
page: 26-31
publication: Optica
publication_identifier:
  issn:
  - 2334-2536
publication_status: published
publisher: Optica Publishing Group
quality_controlled: '1'
status: public
title: 'Laser-cavity locking utilizing beam ellipticity: accessing the 10<sup>−7</sup>
  instability scale relative to cavity linewidth'
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 11
year: '2024'
...