# this file is part of refractiveindex.info database
# refractiveindex.info database is in the public domain
# copyright and related rights waived via CC0 1.0

REFERENCES: |
    B. Zysset, I. Biaggio, P. Günter.
    Refractive indices of orthorhombic KNbO<sub>3</sub>. I. Dispersion and temperature dependence.
    <a href="https://doi.org/10.1364/JOSAB.9.000380"><i>J. Opt. Soc. Am. B</i> <b>9</b>, 380-386 (1992)</a>
COMMENTS: |
    n<sub>β</sub>; 22 °C. See the original publication for temperature dependence.
CONDITIONS:
    temperature: 295
    direction: beta
DATA:
  - type: formula 4
    wavelength_range: 0.40 3.4
    coefficients: 1 1.336582 2 0.2581573 2 2.497064 2 0.1290921 2 -0.02517432 2