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REFERENCES: |
    W. Heitmann and E. Ritter.
    Production and properties of vacuum evaporated films of thorium fluoride.
    <a href="https://doi.org/10.1364/AO.7.000307"><i>Appl. Opt.</i> <b>7</b>, 307-309 (1968)</a><br>
    (Digitization of <a href="https://refractiveindex.info/download/data/1968/Heitmann.png">graphical data</a> and fitting with the Sellmeier dispersion formula: refractiveindex.info)
COMMENTS: |
    ThF<sub>4</sub> film on quartz glass
DATA:
  - type: formula 2
    wavelength_range: 0.26 0.76
    coefficients: 0 1.2485 0.010466