{
  "annotation_id": "db4677e1-d0f9-4d64-9a6d-97a24f1292a5",
  "date_created": "2026-03-02T18:00:59.878000Z",
  "date_modified": "2026-03-02T18:00:59.878000Z",
  "file_hash": "27d3ca10579b49a78f4c1131a1413fe7119574993b24349b5f6f4f782b003ec0",
  "private": false,
  "record": {
    "abstract": "The Q \u0026 A experiment, first proposed and started in 1994, provides a feasible\nway of exploring the quantum vacuum through the detection of vacuum\nbirefringence effect generated by QED loop diagram and the detection of the\npolarization rotation effect generated by photon-interacting (pseudo-)scalar\nparticles. Three main parts of the experiment are: (1) Optics System (including\nassociated Electronic System) based on a suspended 3.5-m high finesse\nFabry-Perot cavity, (2) Ellipsometer using ultra-high extinction-ratio\npolarizer and analyzer, and (3) Magnetic Field Modulation System for generating\nthe birefringence and the polarization rotation effect. In 2002, the Q \u0026 A\nexperiment achieved the Phase I sensitivity goal. During Phase II, we set (i)\nto improve the control system of the cavity mirrors for suppressing the\nrelative motion noise, (ii) to enhance the birefringence signal by setting-up a\n60-cm long 2.3 T transverse permanent magnet rotatable to 10 rev/s, (iii) to\nreduce geometrical noise by inserting a polarization-maintaining optical fiber\n(PM fiber) as a mode cleaner, and (iv) to use ultra-high extinction-ratio\n(10^{-9}) polarizer and analyzer for ellipsometry. Here we report on (iii) \u0026\n(iv); specifically, we present the properties of the PM-fiber mode-cleaner, the\ntransfer function of its suspension system, and the result of our measurement\nof high extinction-ratio polarizer and analyzer.",
    "arxiv_id": "physics/0508153",
    "authors": [
      "Hsien-Hao Mei",
      "Sheng-Jui Chen",
      "Wei-Tou Ni"
    ],
    "categories": [
      "physics.ins-det"
    ],
    "doi": "10.1088/1742-6596/32/1/035",
    "journal_ref": "J.Phys.Conf.Ser. 32 (2006) 236-243",
    "title": "Suspension of the fiber mode-cleaner launcher and measurement of the   high extinction-ratio (10^{-9}) ellipsometer for the Q \u0026 A experiment",
    "url": "https://arxiv.org/abs/physics/0508153"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "c5e9d12b-6ea2-447a-83a3-1e9b79949c61",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}