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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>α</sub>; 20 °C.
CONDITIONS:
    temperature: 293
    direction: alpha
DATA:
  - type: formula 4
    wavelength_range: 0.43 3.54
    coefficients: 3.29100 0.04140 0 0.03978 1 9.35522 0 31.45571 1