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REFERENCES: "D. E. Zelmon, D. L. Small, and D. Jundt. Infrared corrected Sellmeier coefficients for congruently grown lithium niobate and 5 mol.% magnesium oxide-doped lithium niobate, <a href=\"https://doi.org/10.1364/JOSAB.14.003319\"><i>J. Opt. Soc. Am. B</i> <b>14</b>, 3319-3322 (1997)</a>"
COMMENTS: "21 °C. Ordinary ray (o). Congruently grown lithium niobate."
DATA:
  - type: formula 2
    range: 0.4 5.0
    coefficients: 0 2.6734 0.01764 1.2290 0.05914 12.614 474.60
