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Cosmic axions revealed via amplified modulation of the ellipticity of a laser

Hooman Davoudiasl1 and Yannis K. Semertzidis2,*

  • *Contact author: yannis@bnl.gov
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Phys. Rev. D 113, 032012 – Published 17 February, 2026

DOI: https://doi.org/10.1103/2dvg-78kh

Abstract

We propose a new axion dark matter detection strategy that employs optical readout of laser beam ellipticity modulations caused by axion-induced electric fields in a microwave cavity, using electro-optic (EO) crystals, enhanced by externally injected radio-frequency (rf) power. Building upon the variance-based probing method [Phys. Rev. D 107, 103005 (2023).], we extend this concept to the optical domain: A weak probe laser interacts with an EO crystal coupled to the resonant microwave cavity field at cryogenic temperatures, and the axion-induced electric field is revealed through induced ellipticity. The injected rf signal coherently interferes with that of the axion field, amplifying the optical response and significantly improving sensitivity. While our EO-based method employs a Fabry-Pérot resonator, we do not require Michelson interferometers. Our method, hence, enables compact, high-frequency axion searches, across the 0.5–50 GHz range. Operating at cryogenic temperatures not only suppresses thermal backgrounds, but, critically, allows the probing method to mitigate the quantum noise. This approach offers a scalable path forward for axion detection over the ∼(few−200) μeV mass range—covering the preferred parameter space for the postinflationary Peccei-Quinn axion dark matter—using compact, tunable systems.

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Phys. Rev. D 113, 032012– Published 17 February, 2026
  • Received 25 August 2025
  • Accepted 20 January 2026
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