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REFERENCES: |
    1) R. S. Caldwell and H. Y. Fan.
    Optical properties of tellurium and selenium.
    <a href="https://doi.org/10.1103/PhysRev.114.664"><i>Phys. Rev.</i>, <b>114</b>, 664–675 (1959)</a><br>
    2) G. C. Bhar.
    Refractive index interpolation in phase-matching.
    <a href="https://doi.org/10.1364/AO.15.0305_1"><i>Appl. Opt.</i> <b>15</b>, 305–307 (1976)</a><br>
    * Ref. 2 provides a dispersion formula based on data from Ref. 1
COMMENTS: |
    Ordinary ray (o).
CONDITIONS:
    direction: o
DATA:
  - type: formula 2
    wavelength_range: 4 14
    coefficients: 17.5346 4.3289 3.9810 3.7800 11813