# this file is part of refractiveindex.info database
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REFERENCES: "P. A. Williams et al. 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
