{
  "annotation_id": "f4f62b46-60b5-42dd-842f-36fc981d846e",
  "date_created": "2026-03-02T18:02:16.491000Z",
  "date_modified": "2026-03-02T18:02:16.491000Z",
  "file_hash": "77ad50c0a309fa51981587dae88a23323e9f5e3aa0f5a2317afc20f7e8359710",
  "private": false,
  "record": {
    "abstract": "We report the first observation of above-threshold maser oscillation in a\nwhispering-gallery(WG)-mode resonator, whose quasi-transverse-magnetic, 17th\nazimuthal-order WG mode, at a frequency of approx. 12.038 GHz, with a loaded Q\nof several hundred million, is supported on a cylinder of mono-crystalline\nsapphire. An electron spin resonance (ESR) associated with Fe3+ ions, that are\nsubstitutively included within the sapphire at a concentration of a few parts\nper billion, coincides in frequency with that of the (considerably narrower) WG\nmode. By applying a c.w. `pump\u0027 to the resonator at a frequency of approx.\n31.34 GHz, with no applied d.c. magnetic field, the WG (`signal\u0027) mode is\nenergized through a three-level maser scheme. Preliminary measurements\ndemonstrate a frequency stability (Allan deviation) of a few times 1e-14 for\nsampling intervals up to 100 s.",
    "arxiv_id": "quant-ph/0506076",
    "authors": [
      "P. -Y. Bourgeois",
      "N. Bazin",
      "Y. Kersale",
      "V. Giordano",
      "M. E. Tobar",
      "M. Oxborrow"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1063/1.2137452",
    "title": "Maser Oscillation in a Whispering-Gallery-Mode Microwave Resonator",
    "url": "https://arxiv.org/abs/quant-ph/0506076"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b5240e40-a515-4a7f-8574-0d0518dbe206",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}