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REFERENCES: |
    J. J. Carvajal, P. Segonds, A. Peña, J. Zaccaro, B. Boulanger, F. Díaz and M. Aguiló.
    Structural and optical properties of RbTiOPO<sub>4</sub>:Nb crystals.
    <a href="https://doi.org/10.1088/0953-8984/19/11/116214"><i>J. Phys.: Condens. Matter</i> <b>19</b>, 116214, 2007</a>
COMMENTS: |
    n<sub>β</sub>; 293 K (20 °C).
CONDITIONS:
    temperature: 293
    direction: beta
DATA:
  - type: formula 4
    wavelength_range: 0.4 1.5
    coefficients: 2.0360 1.0883 2 0.0437 1 0 0 0 1 -0.0090 2