# 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: 3.1176009 -0.012108189 2 0.044689743 -2 0.0016574765 -4 4.1984442e-05 -6 1.29135e-05 -8
  - type: tabulated k
    data: |
        0.370 5.8313E-06
        0.380 2.2069E-06
        0.390 1.1337E-06
        0.400 7.3024E-07
        0.420 4.1209E-07
        0.440 2.8055E-07
        0.460 2.1483E-07
        0.480 1.6788E-07
        0.500 1.4176E-07
        0.550 7.9499E-08
        0.600 7.2162E-08
        0.650 6.2446E-08
        0.700 5.0361E-08
        0.800 3.1911E-08
        1.060 4.2282E-08
        1.500 7.1835E-08
        2.000 4.1928E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -6.59e-06 1.77e-08 -2.13e-10 1.11e-06 8.72e-10 0.277
    nd: 1.80518
    Vd: 25.4
    glass_code: 805254
    density: 3.4 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 9.3e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 1.07e-05 K<sup>-1</sup>
    dPgF: 0.0136
    climatic_resistance: 1.0
    acid_resistance: 1.0
