# 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 1.77227611 0.0131182633 0.34569125 0.0614479619 2.40788501 200.753254
  - type: tabulated k
    data: |
        0.370 6.2428E-06
        0.380 2.2195E-06
        0.390 1.1069E-06
        0.400 6.3169E-07
        0.420 2.8232E-07
        0.440 1.6122E-07
        0.460 1.1150E-07
        0.480 8.4972E-08
        0.500 6.4177E-08
        0.550 3.0745E-08
        0.600 2.3933E-08
        0.650 3.1129E-08
        0.700 2.2326E-08
        0.800 1.2745E-08
        0.900 1.4338E-08
        1.000 1.5931E-08
        1.200 1.9118E-08
        1.400 3.3473E-08
        1.600 6.3822E-08
        1.800 2.0195E-07
        2.000 3.5405E-07
        2.200 7.5118E-07
        2.400 1.4271E-06
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 25.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -4.43e-06 1.06e-08 -3.14e-11 9.45e-07 1.14e-09 0.303
    nd: 1.805181
    Vd: 25.425363
    glass_code: 805254
    density: 3.37 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 8.9e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 1.07e-05 K<sup>-1</sup>
    dPgF: 0.0158
    climatic_resistance: 1.0
    acid_resistance: 1.0
    phosphate_resistance: 1.0
