# 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: 2.578886 -0.010381408 2 0.014233563 -2 0.00012483021 -4 1.7477672e-05 -6 -9.6204805e-07 -8
  - type: tabulated k
    data: |
        0.310 8.9102E-06
        0.320 5.8635E-06
        0.330 3.8367E-06
        0.340 2.2772E-06
        0.350 1.3359E-06
        0.360 7.4132E-07
        0.370 4.1342E-07
        0.380 2.4230E-07
        0.390 1.3641E-07
        0.400 9.3675E-08
        0.420 5.0514E-08
        0.440 4.2271E-08
        0.460 3.6790E-08
        0.480 3.8389E-08
        0.500 3.5972E-08
        0.550 2.6340E-08
        0.600 2.3933E-08
        0.650 1.5541E-08
        0.700 1.6736E-08
        0.800 1.2745E-08
        1.060 1.6887E-08
        1.500 2.3897E-08
        2.000 2.8909E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -9.04e-06 1.1e-08 -2.48e-10 3.21e-07 4.56e-10 0.226
    nd: 1.61800
    Vd: 63.4
    glass_code: 618634
    density: 3.63 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 7.9e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 9.9e-06 K<sup>-1</sup>
    dPgF: 0.0055
    climatic_resistance: 1.0
    acid_resistance: 5.0
