# 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: 0.37 2.4
    coefficients: 0 2.00722652 0.0135705124 0.442086773 0.0591808873 3.37287426 219.832665
  - type: tabulated k
    data: |
        0.370 7.8298E-06
        0.380 4.3155E-06
        0.390 2.7671E-06
        0.400 1.8456E-06
        0.420 9.1724E-07
        0.440 5.2809E-07
        0.460 3.2117E-07
        0.480 2.2418E-07
        0.500 1.6243E-07
        0.550 6.6149E-08
        0.600 3.3540E-08
        0.650 3.1129E-08
        0.700 2.2326E-08
        0.800 1.2745E-08
        0.900 1.4338E-08
        1.000 7.9617E-09
        1.200 9.5541E-09
        1.400 2.2304E-08
        1.600 3.8255E-08
        1.800 8.6203E-08
        2.000 1.7604E-07
        2.200 4.2529E-07
        2.400 9.7963E-07
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 25.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: 3.5e-07 6.74e-09 -1.38e-11 1.01e-06 1.37e-09 0.298
    nd: 1.902000
    Vd: 25.101413
    glass_code: 902251
    glass_status: special
    density: 3.64 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 8.1e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 9.9e-06 K<sup>-1</sup>
    dPgF: 0.0108
    climatic_resistance: 4.0
    acid_resistance: 2.0
    phosphate_resistance: 1.0
