# 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: 2.9621759 -0.011836005 2 0.037648353 -2 0.0015341601 -4 -1.0776303e-05 -6 1.378924e-05 -8
  - type: tabulated k
    data: |
        0.360 1.9789E-05
        0.370 7.9152E-06
        0.380 3.4645E-06
        0.390 1.6959E-06
        0.400 9.1148E-07
        0.420 3.3732E-07
        0.440 1.7960E-07
        0.460 1.2662E-07
        0.480 8.8880E-08
        0.500 6.0135E-08
        0.550 2.6340E-08
        0.600 3.3540E-08
        0.650 4.1547E-08
        0.700 2.7922E-08
        0.800 3.8312E-08
        1.060 1.6887E-08
        1.500 2.3897E-08
        2.000 2.0826E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -2.91e-06 1.97e-08 -3.23e-10 8.95e-07 9.72e-10 0.291
    nd: 1.75520
    Vd: 27.5
    glass_code: 755275
    density: 3.19 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 8.6e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 9.1e-06 K<sup>-1</sup>
    dPgF: 0.0131
    climatic_resistance: 1.0
    acid_resistance: 1.0
