# 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: 2.9914895 -0.01436707 2 0.024650584 -2 0.00071568019 -4 -2.7938999e-05 -6 3.2293973e-06 -8
  - type: tabulated k
    data: |
        0.320 1.5825E-05
        0.330 7.4323E-06
        0.340 2.9428E-06
        0.350 1.3002E-06
        0.360 6.3568E-07
        0.370 3.5306E-07
        0.380 2.1945E-07
        0.390 1.3965E-07
        0.400 9.3675E-08
        0.420 6.4114E-08
        0.440 4.2271E-08
        0.460 4.0489E-08
        0.480 2.6832E-08
        0.500 1.1955E-08
        0.550 4.3790E-09
        0.600 1.4345E-08
        0.650 1.0355E-08
        0.700 1.6736E-08
        0.800 1.2745E-08
        1.060 1.6887E-08
        1.500 2.3897E-08
        2.000 4.3563E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: 5.27e-06 1.73e-08 -7.19e-11 6.68e-07 9.93e-10 0.203
    nd: 1.75028
    Vd: 45.4
    glass_code: 756456
    density: 4.25 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 5.9e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 8e-06 K<sup>-1</sup>
    dPgF: -0.0098
    climatic_resistance: 1.0
    acid_resistance: 4.0
