# 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: 3.480338 -0.011368322 2 0.05808586 -2 0.0034779702 -4 -0.0001519768 -6 3.6318702e-05 -8
  - type: tabulated k
    data: |
        0.370 1.6257E-05
        0.380 7.7142E-06
        0.390 4.1451E-06
        0.400 2.5488E-06
        0.420 1.2209E-06
        0.440 7.3350E-07
        0.460 4.9718E-07
        0.480 3.5185E-07
        0.500 2.5467E-07
        0.550 9.7364E-08
        0.600 9.1591E-08
        0.650 1.0450E-07
        0.700 7.8537E-08
        0.800 5.1134E-08
        1.060 3.3809E-08
        1.500 8.3850E-08
        2.000 4.8477E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: 3.38e-06 2.43e-08 -2.21e-10 2.2e-06 1.89e-09 0.277
    nd: 1.91643
    Vd: 22.4
    glass_code: 921224
    density: 5.22 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 1.08e-05 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 1.12e-05 K<sup>-1</sup>
    dPgF: 0.0185
    climatic_resistance: 1.0
    acid_resistance: 1.0
