# this file is part of refractiveindex.info database
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REFERENCES: |
    P. A. Williams, A. H. Rose, K. S. Lee, D. C. Conrad, G. W. Day, P. D. Hale.
    Optical, thermo-optic, electro-optic, and photoelastic properties of bismuth germanate Bi<sub>4</sub>Ge<sub>3</sub>O<sub>12</sub>.
    <a href="https://doi.org/10.1364/AO.35.003562"><i>Appl. Opt.</i> <b>35</b>, 3562-3569 (1996)</a>
DATA:
  - type: formula 1
    wavelength_range: 0.305 1.00
    coefficients: 0 3.1218393 0.1807