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REFERENCES: "N. Umemura, K. Miyata, and K. Kato. New data on the optical properties of BiB<sub>3</sub>O<sub>6</sub>, <a href=\"    https://doi.org/10.1016/j.optmat.2006.12.014\"><i>Opt. Mat.</i> <b>30</b>, 532-534 (2007)</a>"
COMMENTS: "n<sub>γ</sub>; 20 °C."
DATA:
  - type: formula 4
    wavelength_range: 0.48 3.1
    coefficients: 3.6545 0.05112 0 0.03713 1 0 0 0 1 -0.02261 2
