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REFERENCES: |
    Q. Zheng, X. Wang, D. Thompson.
    Temperature-dependent optical properties of monocrystalline CaF<sub>2</sub>, BaF<sub>2</sub>, and MgF<sub>2</sub>.
    <a href="https://doi.org/10.1364/OME.496246"><i>Opt. Mater. Express</i> <b>13</b>, 2380–2391 (2023)</a>
    (See Supplementary materials)
COMMENTS: |
    Extraordinary ray (e).
    186.4 °C.
    The supplementary materials of the original publication contain coefficients of the Sellmeier formula for multiple temperatures in the range of 21 °C to 368 °C.
DATA:
  - type: formula 1
    wavelength_range: 0.22 1.7
    coefficients: 0 0.41343 0.036843 0.50287 0.090762 2.4905 23.772
CONDITIONS:
    temperature: 459.55
    direction: e