# 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: 2.7609221 -0.011601354 2 0.029309701 -2 0.0012957192 -4 -3.6971081e-05 -6 9.8723481e-06 -8
  - type: tabulated k
    data: |
        0.360 1.3193E-05
        0.370 4.5122E-06
        0.380 1.7211E-06
        0.390 7.9507E-07
        0.400 4.4695E-07
        0.420 2.2821E-07
        0.440 1.6122E-07
        0.460 1.4562E-07
        0.480 1.2423E-07
        0.500 1.0482E-07
        0.550 7.5045E-08
        0.600 8.1867E-08
        0.650 8.8689E-08
        0.700 8.9847E-08
        0.800 5.7555E-08
        1.060 5.9254E-08
        1.500 1.0792E-07
        2.000 4.0295E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -9.37e-07 1.62e-08 -1.83e-10 7.05e-07 1.05e-09 0.299
    nd: 1.68893
    Vd: 31.1
    glass_code: 689311
    density: 2.94 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 8e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 9.7e-06 K<sup>-1</sup>
    dPgF: 0.0062
    climatic_resistance: 1.0
    acid_resistance: 1.0
