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REFERENCES: |
    1) H. R. Philipp.
    Optical properties of silicon nitride.
    <a href="https://doi.org/10.1149/1.2403440"><i>J. Electrochim. Soc.</i> <b>120</b>, 295-300 (1973)</a><br>
    2) T. Bååk.
    Silicon oxynitride; a material for GRIN optics.
    <a href="https://doi.org/10.1364/AO.21.001069"><i>Appl. Opt.</i> <b>21</b>, 1069-1072 (1982)</a><br>
    * Ref.2 provides a dispersion formula based on data from Ref. 1
DATA:
  - type: formula 1
    wavelength_range: 0.207 1.24
    coefficients: 0 2.8939 0.13967