# 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: "Recommended "
DATA:
  - type: formula 2 
    wavelength_range: 0.35 2.4
    coefficients: 0 1.70984856 0.0100852127 0.173342897 0.0470890831 1.64833565 157.46852
  - type: tabulated k
    data: |
        0.350 8.9652E-06
        0.360 3.7510E-06
        0.370 1.7603E-06
        0.380 9.1052E-07
        0.390 5.0438E-07
        0.400 2.9670E-07
        0.420 1.3644E-07
        0.440 8.5059E-08
        0.460 6.2765E-08
        0.480 4.6114E-08
        0.500 3.5972E-08
        0.550 1.7542E-08
        0.600 1.9137E-08
        0.650 2.5928E-08
        0.700 1.6736E-08
        0.800 1.2745E-08
        0.900 1.4338E-08
        1.000 1.5931E-08
        1.200 9.5541E-09
        1.400 3.3473E-08
        1.600 3.8255E-08
        1.800 1.1505E-07
        2.000 2.5671E-07
        2.200 7.8777E-07
        2.400 2.2256E-06
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 25.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: 2.9e-06 1.29e-08 -3.62e-11 6.72e-07 7.76e-10 0.243
    nd: 1.720000
    Vd: 41.978463
    glass_code: 720420
    density: 4.0 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 6.6e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 7.7e-06 K<sup>-1</sup>
    dPgF: -0.0006
    climatic_resistance: 1.0
    acid_resistance: 3.2
    phosphate_resistance: 1.0
