{
  "abstract": "Continuous-wave light near 148.4 nm enables direct absorption spectroscopy of the thorium-229 nuclear transition. We demonstrate single-pass frequency doubling in strontium tetraborate, delivering an estimated 8.1 nW at 920 mW pump power. At this power, oxygen admission leaves a background of 1.22 kHz, corresponding to an estimated signal-to-background ratio of 3.8 x 10^4 after current-integration calibration. Several crystals grown by top-seeded solution growth produce polarization-dependent VUV signals. Temperature scans reveal distinct maxima among specimens cut from one boule and among positions within a specimen. The source sustains operation over 33.3 h. In a separate 3-h record acquired with 1-ms gates, local referencing achieves near-Poisson averaging, reaching a fractional Allan deviation of 3.5 x 10^-5 at 1000 s. These results establish a practical VUV source for stable, long-duration spectroscopy of weak nuclear absorption.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.18470",
  "author_total": 16,
  "authors": [
    {
      "name": "Hanlin Wang"
    },
    {
      "name": "Zhouzhi Tan"
    },
    {
      "name": "Conghui Huang"
    },
    {
      "name": "Jinming Liu"
    },
    {
      "name": "Xuan Fan"
    },
    {
      "name": "Runzhe Yang"
    },
    {
      "name": "Meng Wang"
    },
    {
      "name": "Tung-Hsun Chung"
    },
    {
      "name": "Yong-Heng Huo"
    },
    {
      "name": "Yin Hang"
    },
    {
      "name": "Zhiwei Jiao"
    },
    {
      "name": "Heng Tu"
    },
    {
      "name": "Lei Zhang"
    },
    {
      "name": "Xu-Fei Yin"
    },
    {
      "name": "Pengfei Wang"
    },
    {
      "name": "Zhiqiang Zhang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/38tq9p3s6sgmx.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.18470",
  "fulltext_url": null,
  "id": "38tq9p3s6sgmx",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.18470",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "3107|Advanced Frequency and Time Standards"
    ]
  ],
  "openalex": "W7221807951",
  "pdf_url": "https://arxiv.org/pdf/2610.18470",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-13",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/38tq9p3s6sgmx.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:11Z",
      "native_id": "2610.18470",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.18470"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Continuous-wave 148.4-nm generation in strontium tetraborate for nuclear absorption spectroscopy",
  "title_text": "Continuous-wave 148.4-nm generation in strontium tetraborate for nuclear absorption spectroscopy",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:11Z",
  "url": "https://research.draconitic.com/paper/38tq9p3s6sgmx",
  "venue": "arXiv",
  "versions": []
}