# 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: 0.34 2.4
    coefficients: 0 1.638472 0.00904853452 0.188330533 0.0372740173 1.47502357 137.77005
  - type: tabulated k
    data: |
        0.340 5.3196E-06
        0.350 2.2240E-06
        0.360 1.0218E-06
        0.370 5.1336E-07
        0.380 2.7193E-07
        0.390 1.6573E-07
        0.400 1.1011E-07
        0.420 6.7523E-08
        0.440 5.2919E-08
        0.460 4.0489E-08
        0.480 3.0681E-08
        0.500 1.9944E-08
        0.550 1.3150E-08
        0.600 1.9137E-08
        0.650 2.0732E-08
        0.700 1.6736E-08
        0.800 1.9127E-08
        0.900 2.1518E-08
        1.000 3.1895E-08
        1.200 3.8274E-08
        1.400 5.5844E-08
        1.600 6.3822E-08
        1.800 1.5844E-07
        2.000 3.2154E-07
        2.200 8.7958E-07
        2.400 3.1039E-06
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 25.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: 1.39e-06 1.16e-08 -3.52e-11 4.18e-07 3.81e-10 0.279
    nd: 1.699998
    Vd: 48.080479
    glass_code: 700481
    glass_status: special
    density: 3.79 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 7.1e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 8e-06 K<sup>-1</sup>
    dPgF: -0.0041
    climatic_resistance: 2.0
    acid_resistance: 51.2
    phosphate_resistance: 1.0
