# 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: 2.7669297 -0.011669996 2 0.02151984 -2 0.00070810281 -4 -2.495822e-05 -6 3.7747946e-06 -8
  - type: tabulated k
    data: |
        0.330 1.4500E-05
        0.340 1.5717E-05
        0.350 6.5855E-06
        0.360 2.9109E-06
        0.370 1.4218E-06
        0.380 7.8251E-07
        0.390 4.5727E-07
        0.400 2.9321E-07
        0.420 1.4690E-07
        0.440 1.0304E-07
        0.460 8.5176E-08
        0.480 5.7730E-08
        0.500 3.9989E-08
        0.550 2.1939E-08
        0.600 1.9137E-08
        0.650 2.0732E-08
        0.700 1.1152E-08
        0.800 1.9127E-08
        1.060 1.6887E-08
        1.500 3.5864E-08
        2.000 3.3778E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -8.23e-07 1.72e-08 -1.68e-10 5.4e-07 8.98e-10 0.251
    nd: 1.68250
    Vd: 44.5
    glass_code: 683445
    density: 3.62 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 7.3e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 8.4e-06 K<sup>-1</sup>
    dPgF: -0.0003
    climatic_resistance: 1.0
    acid_resistance: 4.0
