# 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: 2.8277206 -0.013838479 2 0.0179847 -2 0.00057777884 -4 -3.7712827e-05 -6 2.2935918e-06 -8
  - type: tabulated k
    data: |
        0.310 7.2003E-06
        0.320 4.5123E-06
        0.330 2.8330E-06
        0.340 1.7280E-06
        0.350 1.0660E-06
        0.360 6.5722E-07
        0.370 3.9990E-07
        0.380 3.1860E-07
        0.390 2.6553E-07
        0.400 1.3990E-07
        0.420 1.0870E-07
        0.440 8.8648E-08
        0.460 7.3953E-08
        0.480 6.9381E-08
        0.500 6.0135E-08
        0.550 6.6149E-08
        0.600 4.7987E-08
        0.650 4.6764E-08
        0.700 3.3523E-08
        0.800 1.9127E-08
        1.060 2.5344E-08
        1.500 3.5864E-08
        2.000 5.1762E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -4.5e-07 1.44e-08 -3.03e-10 5.54e-07 7.23e-10 0.135
    nd: 1.69680
    Vd: 55.6
    glass_code: 697556
    density: 3.64 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 6.4e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 8.1e-06 K<sup>-1</sup>
    dPgF: -0.0065
    climatic_resistance: 1.0
    acid_resistance: 5.0
