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REFERENCES: "S. Das et al.. Linear and nonlinear optical properties of ZnGeP<sub>2</sub> crystal for infrared laser device applications: Revisited, <a href=\"https://doi.org/10.1364/AO.42.004335\"><i>Appl. Opt.</i> <b>42</b>, 4335-4340 (2003)</a>"
COMMENTS: "Ordinary ray (o)"
DATA:
  - type: formula 2
    wavelength_range: 1.32 11
    coefficients: 4.67491 4.077926 0.159328 1.896005 900
