# 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: 0.36 2.4
    coefficients: 0 1.5427081 0.0113925005 0.217113891 0.0579224572 1.81904459 167.697189
  - type: tabulated k
    data: |
        0.360 1.3193E-05
        0.370 4.3273E-06
        0.380 1.6472E-06
        0.390 7.3157E-07
        0.400 4.0691E-07
        0.420 1.6792E-07
        0.440 1.0665E-07
        0.460 8.1431E-08
        0.480 6.5494E-08
        0.500 5.2065E-08
        0.550 2.6340E-08
        0.600 2.3933E-08
        0.650 3.1129E-08
        0.700 2.7922E-08
        0.800 1.2745E-08
        0.900 1.4338E-08
        1.000 1.5931E-08
        1.200 1.9118E-08
        1.400 4.4653E-08
        1.600 5.1032E-08
        1.800 1.5844E-07
        2.000 2.7289E-07
        2.200 6.9645E-07
        2.400 1.0199E-06
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 25.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -1.08e-06 1.07e-08 -3.65e-11 7.81e-07 1.09e-09 0.291
    nd: 1.688931
    Vd: 31.075450
    glass_code: 689311
    density: 2.98 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 8.2e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 9.8e-06 K<sup>-1</sup>
    dPgF: 0.0092
    climatic_resistance: 1.0
    acid_resistance: 1.0
    phosphate_resistance: 1.0
