# 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 1.59921608 0.0116469304 0.259532164 0.0584824883 2.12454543 186.927779
  - type: tabulated k
    data: |
        0.370 5.0490E-06
        0.380 1.8633E-06
        0.390 8.1115E-07
        0.400 4.4328E-07
        0.420 1.6792E-07
        0.440 1.0304E-07
        0.460 7.7690E-08
        0.480 6.1610E-08
        0.500 4.8035E-08
        0.550 2.1939E-08
        0.600 2.3933E-08
        0.650 3.6335E-08
        0.700 2.7922E-08
        0.800 1.2745E-08
        0.900 7.1656E-09
        1.000 7.9617E-09
        1.200 9.5541E-09
        1.400 4.4653E-08
        1.600 6.3822E-08
        1.800 2.0195E-07
        2.000 3.5405E-07
        2.200 9.3489E-07
        2.400 1.4271E-06
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 25.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -1.15e-06 1.28e-08 -3.62e-11 7.62e-07 1.01e-09 0.306
    nd: 1.721507
    Vd: 29.232330
    glass_code: 722292
    density: 3.07 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 8.3e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 9.8e-06 K<sup>-1</sup>
    dPgF: 0.0111
    climatic_resistance: 1.0
    acid_resistance: 1.0
    phosphate_resistance: 1.0
