{
  "alternatives": [
    {
      "category": "optical",
      "conditions": {
        "temperature_C": 25,
        "wavelength_nm": 1064
      },
      "id": "dne-dt/cln/jundt1997-1064nm",
      "kind": "scalar",
      "name": "Thermo-optic coefficient, extraordinary",
      "property": "dne-dt",
      "provenance": {
        "derivation": "derivative of the Jundt 1997 n_e(T) Sellmeier at 25 C; coefficients status S (via a secondary source)",
        "source_id": "jundt1997",
        "status": "C",
        "transcribed": "2026-10-25"
      },
      "public": true,
      "symbol": "dn_e/dT",
      "unit": {
        "display": "1/K",
        "qudt": "http://qudt.org/vocab/unit/PER-K",
        "ucum": "/K"
      },
      "value": 4.01e-05,
      "variant": "cln"
    },
    {
      "category": "optical",
      "conditions": {
        "temperature_C": 25,
        "wavelength_nm": 633
      },
      "id": "dne-dt/cln/jundt1997-633nm",
      "kind": "scalar",
      "name": "Thermo-optic coefficient, extraordinary",
      "property": "dne-dt",
      "provenance": {
        "derivation": "derivative of the Jundt 1997 n_e(T) Sellmeier at 25 C; coefficients status S (via a secondary source)",
        "source_id": "jundt1997",
        "status": "C",
        "transcribed": "2026-10-25"
      },
      "public": true,
      "symbol": "dn_e/dT",
      "unit": {
        "display": "1/K",
        "qudt": "http://qudt.org/vocab/unit/PER-K",
        "ucum": "/K"
      },
      "value": 4.89e-05,
      "variant": "cln"
    },
    {
      "category": "optical",
      "conditions": {
        "temperature_C": null,
        "temperature_text": "300 K",
        "wavelength_nm": 1523
      },
      "id": "dne-dt/cln/moretti2005-1523nm",
      "kind": "scalar",
      "name": "Thermo-optic coefficient, extraordinary",
      "notes": "Quoted by zhu2021; moretti2005's own table not read.",
      "property": "dne-dt",
      "provenance": {
        "source_id": "moretti2005",
        "status": "S",
        "transcribed": "2026-10-25",
        "via": "zhu2021"
      },
      "public": true,
      "symbol": "dn_e/dT",
      "unit": {
        "display": "1/K",
        "qudt": "http://qudt.org/vocab/unit/PER-K",
        "ucum": "/K"
      },
      "value": 3.34e-05,
      "variant": "cln"
    },
    {
      "category": "optical",
      "conditions": {
        "temperature_text": "300 K",
        "wavelength_nm": 632
      },
      "id": "dne-dt/cln/moretti2005-632nm-300k",
      "kind": "scalar",
      "name": "Thermo-optic coefficient, extraordinary",
      "notes": "16% below the Jundt-derived value at 633 nm.",
      "property": "dne-dt",
      "provenance": {
        "derivation": "dn_e/dT = (-2.6 + 22.4e-3 T) x 1.0e-5 per K evaluated at T = 300 K (T in K inferred); formula status S",
        "locator": "schwesyg2011 Eqs. (2.26)-(2.27)",
        "source_id": "moretti2005",
        "status": "C",
        "transcribed": "2026-10-25",
        "via": "schwesyg2011"
      },
      "public": true,
      "symbol": "dn_e/dT",
      "unit": {
        "display": "1/K",
        "qudt": "http://qudt.org/vocab/unit/PER-K",
        "ucum": "/K"
      },
      "value": 4.12e-05,
      "variant": "cln"
    }
  ],
  "meta": {
    "api_version": "v1",
    "attribution": "lithium-niobate.com data compiled by Wentao Jiang; cite the original sources listed per value.",
    "data_version": "0.1.0",
    "documentation": "https://lithium-niobate.com/api/openapi.json",
    "license": {
      "id": "CC-BY-4.0",
      "name": "Creative Commons Attribution 4.0 International",
      "url": "https://creativecommons.org/licenses/by/4.0/"
    },
    "property": "dne-dt",
    "variant": "cln"
  },
  "recommended": [
    {
      "category": "optical",
      "conditions": {
        "temperature_C": 25,
        "wavelength_nm": 1550
      },
      "default": true,
      "id": "dne-dt/cln/jundt1997-1550nm",
      "kind": "scalar",
      "name": "Thermo-optic coefficient, extraordinary",
      "property": "dne-dt",
      "provenance": {
        "derivation": "derivative of the Jundt 1997 n_e(T) Sellmeier at 25 C; coefficients status S (via a secondary source)",
        "source_id": "jundt1997",
        "status": "C",
        "transcribed": "2026-10-25"
      },
      "public": true,
      "symbol": "dn_e/dT",
      "unit": {
        "display": "1/K",
        "qudt": "http://qudt.org/vocab/unit/PER-K",
        "ucum": "/K"
      },
      "value": 3.75e-05,
      "variant": "cln"
    }
  ],
  "recommended_note": null,
  "spread": {
    "max": 4.89e-05,
    "min": 3.34e-05,
    "n_records": 5,
    "note": "Range over all public records regardless of conditions; compare conditions before use.",
    "unit": "/K"
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}