# 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: 3.418365 -0.015830577 2 0.056024892 -2 0.0042907055 -4 -0.00027089374 -6 4.8560287e-05 -8
  - type: tabulated k
    data: |
        0.380 1.6697E-05
        0.390 7.7620E-06
        0.400 4.2635E-06
        0.420 1.8379E-06
        0.440 1.1163E-06
        0.460 8.5362E-07
        0.480 6.9336E-07
        0.500 5.4041E-07
        0.550 2.1529E-07
        0.600 1.0134E-07
        0.650 8.3430E-08
        0.700 5.5985E-08
        0.800 3.8312E-08
        1.060 1.6887E-08
        1.500 7.1835E-08
        2.000 4.0295E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -3.11e-06 1.75e-08 -2.81e-10 1.25e-06 1.62e-09 0.307
    nd: 1.89945
    Vd: 21.3
    glass_code: 907212
    density: 4.15 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 7.4e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 1.02e-05 K<sup>-1</sup>
    dPgF: 0.0238
    climatic_resistance: 1.0
    acid_resistance: 1.0
