{
  "abstract": "Nonlinear harmonic generation in microcavities offers a compelling route toward energy efficient on-chip short-wavelength coherent light sources, enabled by tight optical confinement within compact mode volumes and flexible dispersion engineering. Tantalum pentoxide (Ta2O5) photonic platforms are particularly promising for realizing such nonlinear processes: their broad transparency window (280-8000 nm) supports broadband operation, their large bandgap suppresses two-photon absorption, and their thick-film deposition capability enables dispersion management--features that can collectively enhance the performance of nonlinear light sources. Here, we demonstrate, to the best of our knowledge, the first efficient third-harmonic generation (THG) in high-Q Ta2O5 microcavities. These microcavities feature smooth surfaces and high loaded Q factors up to 2.67X10^6, thereby facilitating nonlinear interactions. Through dispersion engineering, efficient THG is realized in both suspended microdisks and monolithic microrings under telecom-band continuous-wave laser pumping, as confirmed by optical spectra, visible-light microscopy, and the near-cubic pump-power dependence of the conversion efficiency. This work lays a foundation for chip-scale f-3f self-referencing of frequency combs and next-generation integrated nonlinear photonics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.30579",
  "author_total": 7,
  "authors": [
    {
      "name": "Xinke Xing"
    },
    {
      "name": "Yixuan Yang"
    },
    {
      "name": "Xinzhi Zheng"
    },
    {
      "name": "Renhong Gao"
    },
    {
      "name": "Li Deng"
    },
    {
      "name": "Jintian Lin"
    },
    {
      "name": "Ya Cheng"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6btw8vyra3ge3.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.30579",
  "fulltext_url": null,
  "id": "6btw8vyra3ge3",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.30579",
  "language": null,
  "licence": "CC-BY-NC-SA-4.0",
  "licence_label": "CC BY-NC-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "2208|Photonic and Optical Devices"
    ]
  ],
  "openalex": "W7223322420",
  "pdf_url": "https://arxiv.org/pdf/2610.30579",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6btw8vyra3ge3.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:34Z",
      "native_id": "2610.30579",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.30579"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Efficient third-harmonic generation in high-Q tantalum pentoxide microcavities",
  "title_text": "Efficient third-harmonic generation in high-Q tantalum pentoxide microcavities",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:34Z",
  "url": "https://research.draconitic.com/paper/6btw8vyra3ge3",
  "venue": "arXiv",
  "versions": []
}