# this file is part of refractiveindex.info database
# refractiveindex.info database is in the public domain
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REFERENCES: |
    J. Pastrňák and L. Roskovcová.
    Refraction index measurements on AlN single crystals.
    <a href="https://doi.org/10.1002/pssb.19660140127"><i>Phys. Stat. Sol.</i> <b>14</b>, K5-K8 (1966)</a>
COMMENTS: |
    Extraordinary ray (e).
CONDITIONS:
    direction: e
DATA:
  - type: formula 1
    wavelength_range: 0.22 5.0
    coefficients: 2.0729 1.6173 0.1746 4.139 15.03