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REFERENCES: "K. Kato and N. Umemura. Sellmeier equations for GaS and GaSe and their applications to the nonlinear optics in GaS<sub>x</sub>Se<sub>1−x</sub>, <a href=\"https://doi.org/10.1364/OL.36.000746\"><i>Opt. Lett.</i> <b>36</b>, 746-747 (2011)</a>"
COMMENTS: "Room temperature. Ordinary ray (o)."
DATA:
  - type: formula 4
    wavelength_range: 0.633 10.591
    coefficients: 7.12996 0.26073 0 0.04627 1 127.335 0 258.431 1
