# 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: 0.36 1.55
    coefficients: 3.124535 -0.014985014 2 0.024795878 -2 0.00096271556 -4 -6.4587038e-05 -6 4.6162437e-06 -8
  - type: tabulated k
    data: |
        0.320 7.6286E-06
        0.330 5.5245E-06
        0.340 2.6828E-06
        0.350 1.4228E-06
        0.360 8.1271E-07
        0.370 4.8198E-07
        0.380 2.9518E-07
        0.390 1.9534E-07
        0.400 1.3990E-07
        0.420 9.8359E-08
        0.440 8.1473E-08
        0.460 7.0220E-08
        0.480 6.9381E-08
        0.500 6.0135E-08
        0.550 5.2839E-08
        0.600 5.7642E-08
        0.650 4.1547E-08
        0.700 3.3523E-08
        0.800 1.9127E-08
        1.060 1.6887E-08
        1.500 2.3897E-08
        2.000 5.1762E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: 2.27e-06 1.53e-08 -2.61e-10 5.42e-07 5.61e-10 0.206
    nd: 1.78830
    Vd: 47.4
    glass_code: 788474
    density: 4.76 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 5.4e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 7.2e-06 K<sup>-1</sup>
    dPgF: -0.0104
    climatic_resistance: 1.0
    acid_resistance: 3.0
