{
  "annotation_id": "1a564fb6-785b-47fd-973c-9baed25e3a43",
  "date_created": "2026-03-02T18:00:46.868000Z",
  "date_modified": "2026-03-02T18:00:46.868000Z",
  "file_hash": "85ee91146cdd2c6d150f171192bbb07e68fb324c969b828f43510d3717af9df8",
  "private": false,
  "record": {
    "abstract": "We demonstrate a new technique for saturated-absorption spectroscopy using\nco-propagating beams that does not have the problem of crossover resonances.\nThe pump beam is locked to a transition and its absorption signal is monitored\nwhile the probe beam is scanned. As the probe comes into resonance with another\ntransition, the pump absorption is reduced and the signal shows a Doppler-free\ndip. We use this technique to measure hyperfine intervals in the $D_2$ line of\n$^{85}$Rb with a precision of 70 kHz, and to resolve hyperfine levels in the\n$D_2$ line of $^{39}$K that are less than 10 MHz apart.",
    "arxiv_id": "physics/0307095",
    "authors": [
      "Ayan Banerjee",
      "Vasant Natarajan"
    ],
    "categories": [
      "physics.atom-ph",
      "physics.optics"
    ],
    "doi": "10.1364/OL.28.001912",
    "journal_ref": "Optics Letters, vol. 28 (20), pp. 1912-1914 (2003)",
    "title": "Saturated-absorption spectroscopy: Eliminating crossover resonances   using co-propagating beams",
    "url": "https://arxiv.org/abs/physics/0307095"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "70b376c9-92ef-4f8d-a662-0cc050243149",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}