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REFERENCES: |
    V. Badikov, D. Badikov, G. Shevyrdyaeva, A. Tyazhev, G. Marchev, V. Panyutin, V. Petrov, A. Kwasniewski.
    Phase-matching properties of BaGa<sub>4</sub>S<sub>7</sub> and BaGa<sub>4</sub>Se<sub>7</sub>: Wide-bandgap nonlinear crystals for the mid-infrared.
    <a href="https://doi.org/10.1002/pssr.201004425"><i>Phys. Status Solidi RRL</i>, <b>5</b>, 31–33 (2010)</a>
COMMENTS: |
    n<sub>β</sub>; room temperature.
CONDITIONS:
    direction: beta
DATA:
  - type: formula 4
    wavelength_range: 0.48 10.4
    coefficients: 7.323096 0.292889 0 0.052725 1 1573.474 0 1182.324 1