# 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/ohara_2017-11-30.agf\">OHARA Zemax catalog 2017-11-30</a> (obtained from <a href=\"http://www.ohara-inc.co.jp/en/product/optical/list/\">http://www.ohara-inc.co.jp</a>)<br>See also <a href=\"http://refractiveindex.info/download/data/2017/ohara_2017-11-30.pdf\">OHARA glass data sheets</a>"
COMMENTS: "Low Softening Temperature "
DATA:
  - type: formula 2 
    wavelength_range: 0.3 2.4
    coefficients: 0 1.52780829 0.0114135883 0.232776367 0.0559068566 1.71638781 171.5118
  - type: tabulated k
    data: |
        0.350 1.2826E-05
        0.360 4.4709E-06
        0.370 1.5041E-06
        0.380 6.0010E-07
        0.390 3.1666E-07
        0.400 1.9696E-07
        0.420 1.0525E-07
        0.440 7.4313E-08
        0.460 5.9043E-08
        0.480 4.6114E-08
        0.500 3.5972E-08
        0.550 1.3150E-08
        0.600 1.9137E-08
        0.650 2.5928E-08
        0.700 1.6736E-08
        0.800 6.3694E-09
        0.900 7.1656E-09
        1.000 7.9617E-09
        1.200 9.5541E-09
        1.400 2.2304E-08
        1.600 6.3822E-08
        1.800 2.8938E-07
        2.000 6.1658E-07
        2.200 1.3271E-06
        2.400 2.2256E-06
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 25.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -6.17e-06 5.7e-09 -3.8e-11 9.99e-07 1.21e-09 0.26
    nd: 1.689479
    Vd: 31.023399
    glass_code: 689311
    density: 2.88 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 1.01e-05 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 1.3e-05 K<sup>-1</sup>
    dPgF: 0.0074
    climatic_resistance: 1.0
    acid_resistance: 1.0
    phosphate_resistance: 1.0
