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REFERENCES: |
    K. Kato, V. V. Badikov, K. Miyata, V. Petrov.
    Refined Sellmeier equations for BaGa<sub>4</sub>S<sub>7</sub>.
    <a href="https://doi.org/10.1364/AO.430424"><i>Appl. Opt.</i>, <b>60</b>, 6600–6603 (2021)</a>
COMMENTS: |
    n<sub>α</sub>; room temperature.
CONDITIONS:
    direction: alpha
DATA:
  - type: formula 4
    wavelength_range: 0.633 8.82
    coefficients: 6.39731 0.15895 0 0.02841 1 811.45 0 606.97 1