# 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: 3.1507226 -0.012460963 2 0.029910697 -2 0.00050733106 -4 3.6278868e-05 -6 -2.5019766e-08 -8
  - type: tabulated k
    data: |
        0.310 1.2240E-05
        0.320 1.0093E-05
        0.330 4.6379E-06
        0.340 2.2835E-06
        0.350 1.2561E-06
        0.360 7.2283E-07
        0.370 4.5093E-07
        0.380 2.7524E-07
        0.390 1.8873E-07
        0.400 1.4323E-07
        0.420 8.8048E-08
        0.440 8.1473E-08
        0.460 6.6490E-08
        0.480 4.6114E-08
        0.500 3.5972E-08
        0.550 2.6340E-08
        0.600 2.3933E-08
        0.650 2.0732E-08
        0.700 1.6736E-08
        0.800 3.8312E-08
        1.060 1.6887E-08
        1.500 2.3897E-08
        2.000 3.0530E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: 3.38e-07 3.13e-08 -2.27e-11 6.92e-07 5.55e-10 0.218
    nd: 1.79950
    Vd: 42.3
    glass_code: 800423
    density: 4.39 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 6.9e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 8e-06 K<sup>-1</sup>
    dPgF: -0.006
    climatic_resistance: 1.0
    acid_resistance: 3.0
