# 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: "<a href=\"http://refractiveindex.info/download/data/2017/sumita_2017-02-02.agf\">SUMITA Zemax catalog 2017-02-02</a> (obtained from <a href=\"http://www.sumita-opt.co.jp/en/download/\">http://www.sumita-opt.co.jp</a>)<br>See also <a href=\"http://refractiveindex.info/download/data/2016/sumita_2016-02-01.pdf\">SUMITA optical glass data book</a>"
DATA:
  - type: formula 3 
    wavelength_range: 0.4 1.55
    coefficients: 4.2741747 -0.015216929 2 0.086704477 -2 0.011238379 -4 -0.0013209006 -6 0.00017823575 -8
  - type: tabulated k
    data: |
        0.405 2.6483E-05
        0.420 6.6807E-06
        0.440 1.5053E-06
        0.460 5.4905E-07
        0.480 2.7023E-07
        0.500 1.4670E-07
        0.550 5.8474E-08
        0.600 3.1863E-08
        0.650 3.4518E-08
        0.700 3.7173E-08
        0.800 4.2484E-08
        1.060 5.6291E-08
        1.500 7.9657E-08
        2.000 3.7267E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: 1.6e-05 2.83e-08 -1.6e-10 3.11e-06 2.04e-09 0.316
    nd: 2.14355
    Vd: 17.8
    glass_code: 144178
    density: 7.06 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 8.3e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 9.8e-06 K<sup>-1</sup>
    dPgF: 0.0458
    climatic_resistance: 1.0
    acid_resistance: 3.0
