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  • Letter
  • Open Access

Bright squeezed light generation via nonclassical power stabilization

Jasper R. Venneberg*, Henning Vahlbruch, Marina Trad Nery, and Benno Willke

  • Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut) und Institut für Gravitationsphysik, Leibniz Universität Hannover, Callinstraße 38, 30167 Hannover, Germany

  • *Contact author: jasper.venneberg@aei.mpg.de
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Phys. Rev. Research 7, L022040 – Published 20 May, 2025

DOI: https://doi.org/10.1103/PhysRevResearch.7.L022040

Abstract

Low-power-noise lasers are essential for many high-precision experiments. Shot noise imposes a fundamental limit on the power stability achievable with classical light sources. In this Letter, we report the generation of bright squeezed light in the audio band, which can improve the sensitivity of otherwise shot-noise-limited measurements. The bright squeezed light source is experimentally realized via the use of squeezed vacuum in a power stabilization scheme. We demonstrate a laser beam at a power of 9.9 mW with a broadband power noise suppression below the classical stabilization limit by up to 8.7−0.4+0.3dB in the audio band, resulting in a bright squeezed beam with a power noise of 5.7−0.4+0.3dB below shot noise for frequencies from 6 kHz to 20 kHz. We further conceptually outline a method to surpass this result in the future.

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Phys. Rev. Research 7, L022040– Published 20 May, 2025
  • Received 9 December 2024
  • Accepted 29 April 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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