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REFERENCES: "D. Zhang, Y. Kong, J.-Y. Zhang. Optical parametric properties of 532-nm-pumped beta-barium-borate near the infrared absorption edge, <a href=\"https://doi.org/10.1016/S0030-4018(00)00968-8\"><i>Optics Communications</i>, <b>184</b>, 485-491 (2000)</a>"
COMMENTS: "Beta barium borate (ß-BaB<sub>2</sub>O<sub>4</sub>, BBO). Extraordinary ray (e). Near infrared."
DATA:
  - type: formula 4
    range: 0.64 3.18
    coefficients: 2.3753 0.01224 0 0.01667 1 0 0 0 1 -0.01627 2 0.0005716 4 -0.00006305 6
