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REFERENCES: |
    K. Kato, K. Miyata, V. Petrov.
    Phase-matching properties of BaGa<sub>4</sub>Se<sub>7</sub> for SHG and SFG in the 0.901–10.5910 μm range.
    <a href="https://doi.org/10.1364/AO.56.002978"><i>Appl. Opt.</i>, <b>56</b>, 2978–2981 (2017)</a>
COMMENTS: |
    n<sub>β</sub>; room temperature.
CONDITIONS:
    direction: beta
DATA:
  - type: formula 4
    wavelength_range: 0.901 10.591
    coefficients: 6.86603 0.26816 0 0.04259 1 682.97 0 781.78 1