{
  "abstract": "The Any Light Particle Search II employs a highly sensitive heterodyne detection system to measure an ultra-weak electromagnetic field that is reconverted from axions inside a regeneration cavity (RC). The initial design of the heterodyne system utilized a local oscillator laser (LO) that was resonant with the RC to form an interference beatnote with the weak signal field exiting the cavity. A weakness of this design is that it is possible for the out-of-mode field component of the LO to be larger than the in-mode component, allowing its noise to dominate the optical component of the noise budget and reducing the SNR of the experiment. This problem can be addressed by introducing a second, non-resonant laser as the LO. Since the in-mode light of this laser does not couple to the cavity, significantly more of its power is reflected than when the LO is resonant. We present a model for the measurement noise that predicts these design changes increase the SNR by a factor of roughly 35. This model was then confirmed experimentally by injecting a weak signal to the RC and examining the difference in the sensitivity of the detection system in each of these configurations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.03376",
  "author_total": 4,
  "authors": [
    {
      "name": "Henry Frädrich"
    },
    {
      "name": "Aaron D. Spector"
    },
    {
      "name": "Axel Lindner"
    },
    {
      "name": "Guido Müller"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ev31ma49rhy75.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.03376",
  "fulltext_url": null,
  "id": "ev31ma49rhy75",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.03376",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "3106|Dark Matter and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7220461698",
  "pdf_url": "https://arxiv.org/pdf/2610.03376",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ev31ma49rhy75.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:34Z",
      "native_id": "2610.03376",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.03376"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Two-Laser Heterodyne Detection System for ALPS II",
  "title_text": "Two-Laser Heterodyne Detection System for ALPS II",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:34Z",
  "url": "https://research.draconitic.com/paper/ev31ma49rhy75",
  "venue": "arXiv",
  "versions": []
}