# this file is part of refractiveindex.info database
# refractiveindex.info database is in the public domain
# copyright and related rights waived via CC0 1.0

REFERENCES: |
    D. Eimerl, L. Davis, S. Velsko, E. K. Graham, A. Zalkin.
    Optical, mechanical, and thermal properties of barium borate.
    <a href="https://doi.org/10.1063/1.339536"><i>J. Appl. Phys.</i>, <b>62</b>, 1968-1983 (1987)</a>
COMMENTS: |
    Beta barium borate (ß-BaB<sub>2</sub>O<sub>4</sub>, BBO). Extraordinary ray (e).
CONDITIONS:
    direction: e
DATA:
  - type: formula 4
    wavelength_range: 0.22 1.06
    coefficients: 2.3730 0.0128 0 0.0156 1 0 0 0 1 -0.0044 2