# this file is part of refractiveindex.info database
# refractiveindex.info database is in the public domain
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REFERENCES: "S. Singh, J. P. Remeika, and J. R. Potopowicz. Nonlinear optical properties of ferroelectric lead titanate, <a href=\"https://doi.org/10.1063/1.1654078\"><i>Appl. Phys. Lett.</i> <b>20</b>, 135, 1972</a>"
COMMENTS: "Ordinary ray (o)"
DATA:
  - type: formula 2
    wavelength_range: 0.45 1.15
    coefficients: 0 5.3635 0.050267
