{
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    {
      "category": "optical",
      "conditions": {
        "temperature_C": 25,
        "wavelength_nm": 632.8
      },
      "id": "refractive-index-o/sln/weis1985-boyd1967",
      "kind": "scalar",
      "name": "Ordinary refractive index",
      "notes": "Conflicts with volk2008 near-SLN values.",
      "property": "refractive-index-o",
      "provenance": {
        "locator": "Table 2, p. 197",
        "original_reference": "Boyd, Bond, Carter, J. Appl. Phys. 38, 1941 (1967)",
        "source_id": "weis1985",
        "status": "P-comp",
        "transcribed": "2026-10-25"
      },
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      "symbol": "n_o",
      "unit": {
        "display": "-",
        "qudt": "http://qudt.org/vocab/unit/UNITLESS",
        "ucum": "1"
      },
      "value": 2.291,
      "variant": "sln",
      "variant_note": "labelled 'stoichiometric' (1967 crystal)"
    }
  ],
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    "attribution": "lithium-niobate.com data compiled by Wentao Jiang; cite the original sources listed per value.",
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    "documentation": "https://lithium-niobate.com/api/openapi.json",
    "license": {
      "id": "CC-BY-4.0",
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      "url": "https://creativecommons.org/licenses/by/4.0/"
    },
    "property": "refractive-index-o",
    "variant": "sln"
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  "recommended": [
    {
      "category": "optical",
      "conditions": {
        "wavelength_nm": 633
      },
      "default": true,
      "id": "refractive-index-o/sln/volk2008-633nm",
      "kind": "scalar",
      "name": "Ordinary refractive index",
      "property": "refractive-index-o",
      "provenance": {
        "locator": "Table 1.2, p. 4 (refs. [26-28])",
        "source_id": "volk2008",
        "status": "P-comp",
        "transcribed": "2026-10-25"
      },
      "public": true,
      "symbol": "n_o",
      "unit": {
        "display": "-",
        "qudt": "http://qudt.org/vocab/unit/UNITLESS",
        "ucum": "1"
      },
      "value": 2.288,
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