{
  "annotation_id": "6f4c04b1-4f28-4297-9b2f-caa3004de0ac",
  "date_created": "2026-03-02T18:00:35.383000Z",
  "date_modified": "2026-03-02T18:00:35.383000Z",
  "file_hash": "ad920493fab2ba527f961b19d70bf5607409ebf8eba9a0a431a85fbd754fb7c6",
  "private": false,
  "record": {
    "abstract": "We developed a novel technique for frequency measurement and synthesis, based\non the operation of a femtosecond comb generator as transfer oscillator. The\ntechnique can be used to measure frequency ratios of any optical signals\nthroughout the visible and near-infrared part of the spectrum. Relative\nuncertainties of $10^{-18}$ for averaging times of 100 s are possible. Using a\nNd:YAG laser in combination with a nonlinear crystal we measured the frequency\nratio of the second harmonic $\\nu_{SH}$ at 532 nm to the fundamental $\\nu_0$ at\n1064 nm, $\\nu_{SH}/\\nu_0 = 2.000 000 000 000 000 001 \\times (1 \\pm 7 \\times\n10^{-19})$.",
    "arxiv_id": "physics/0108062",
    "authors": [
      "J\u00f6rn Stenger",
      "Harald Schnatz",
      "Christian Tamm",
      "Harald R. Telle"
    ],
    "categories": [
      "physics.optics"
    ],
    "doi": "10.1103/PhysRevLett.88.073601",
    "title": "Ultra-precise measurement of optical frequency ratios",
    "url": "https://arxiv.org/abs/physics/0108062"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "6484cddf-49d0-4be5-a8a4-190ba0c78ecb",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}