{
  "annotation_id": "2c0ad277-ede2-469a-978f-129350fffa62",
  "date_created": "2026-03-02T18:01:11.449000Z",
  "date_modified": "2026-03-02T18:01:11.449000Z",
  "file_hash": "5017a306bcadc24b933ffc363354abec0bb6a4a3aa51b75ef4e01f20db74aa0c",
  "private": false,
  "record": {
    "abstract": "We report the direct observation of periodic intensity modulation of a laser\npulse propagating in a hollow core waveguide. A series of equally spaced plasma\nsparks along the gas-filled capillary is produced. This effect can be explained\nby the beating of different fiber modes, which are excited by controlling the\nsize of the focal spot at the capillary entrance. As compared to an artificial\nmodulated waveguide structure, our presented approach represents an easier and\nmore flexible quasi-phase-matching scheme for nonlinear-optical frequency\nconversion.",
    "arxiv_id": "physics/0609080",
    "authors": [
      "T. Pfeifer",
      "M. C. Downer"
    ],
    "categories": [
      "physics.optics"
    ],
    "doi": "10.1364/JOSAB.24.001025",
    "title": "Direct experimental observation of periodic intensity modulation along   straight hollow core optical waveguides",
    "url": "https://arxiv.org/abs/physics/0609080"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f7ecf252-fe3b-45f2-a6b3-d5782cdbadd9",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}