# this file is part of refractiveindex.info database
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REFERENCES: "K. Kato and E. Takaoka. Sellmeier and thermo-optic dispersion formulas for KTP, <a href=\"https://doi.org/10.1364/AO.41.005040\"><i>Appl. Opt.</i> <b>41</b>, 5040-5044 (2002)</a>."
COMMENTS: "n<sub>β</sub>; 20 °C."
DATA:
  - type: formula 4
    wavelength_range: 0.43 3.54
    coefficients: 3.45018 0.04341 0 0.04597 1 16.98825 0 39.43799 1
