# this file is part of refractiveindex.info database
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REFERENCES: |
    S. Singh, J. P. Remeika, 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: |
    Extraordinary ray (e)
CONDITIONS:
    direction: e
DATA:
  - type: formula 2
    wavelength_range: 0.45 1.15
    coefficients: 0 5.3660 0.047148