# 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: 2.6383229 -0.010806956 2 0.016153414 -2 0.00046673954 -4 -2.5414619e-05 -6 1.9703165e-06 -8
  - type: tabulated k
    data: |
        0.330 7.8670E-06
        0.340 5.6046E-06
        0.350 2.3832E-06
        0.360 1.1516E-06
        0.370 5.6285E-07
        0.380 2.9518E-07
        0.390 1.5919E-07
        0.400 9.3675E-08
        0.420 4.0350E-08
        0.440 3.5190E-08
        0.460 3.3094E-08
        0.480 2.2987E-08
        0.500 2.3945E-08
        0.550 2.1939E-08
        0.600 2.3933E-08
        0.650 1.5541E-08
        0.700 1.1152E-08
        0.800 1.2745E-08
        1.060 2.5344E-08
        1.500 9.5877E-08
        2.000 4.6837E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -1.85e-06 1.9e-08 -1.3e-10 4.59e-07 9.89e-10 0.204
    nd: 1.63854
    Vd: 55.5
    glass_code: 639555
    density: 3.69 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 6.8e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 8.1e-06 K<sup>-1</sup>
    dPgF: -0.0018
    climatic_resistance: 3.0
    acid_resistance: 5.0
