# 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 - Lightweight "
DATA:
  - type: formula 2 
    wavelength_range: 0.37 2.4
    coefficients: 0 1.64797648 0.0121917693 0.267261917 0.0597893039 2.19772845 192.15834
  - type: tabulated k
    data: |
        0.370 5.3958E-06
        0.380 2.0362E-06
        0.390 9.3449E-07
        0.400 5.1731E-07
        0.420 2.0680E-07
        0.440 1.2838E-07
        0.460 9.2677E-08
        0.480 7.3273E-08
        0.500 5.6098E-08
        0.550 2.6340E-08
        0.600 2.8734E-08
        0.650 3.6335E-08
        0.700 2.7922E-08
        0.800 6.3694E-09
        0.900 7.1656E-09
        1.000 7.9617E-09
        1.200 9.5541E-09
        1.400 3.3473E-08
        1.600 5.1032E-08
        1.800 1.7293E-07
        2.000 3.2154E-07
        2.200 8.0609E-07
        2.400 1.3245E-06
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 25.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -1.99e-06 1.19e-08 -3.46e-11 8.53e-07 1.06e-09 0.297
    nd: 1.739998
    Vd: 28.296005
    glass_code: 740283
    density: 3.11 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 8.5e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 1e-05 K<sup>-1</sup>
    dPgF: 0.0122
    climatic_resistance: 1.0
    acid_resistance: 1.0
    phosphate_resistance: 1.0
