# 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 1.72677471 0.0129369958 0.324568628 0.0618255245 2.65816809 221.904637
  - type: tabulated k
    data: |
        0.370 7.4367E-06
        0.380 2.7708E-06
        0.390 1.2896E-06
        0.400 7.1029E-07
        0.420 2.9690E-07
        0.440 1.8698E-07
        0.460 1.3421E-07
        0.480 1.0455E-07
        0.500 8.0384E-08
        0.550 3.5155E-08
        0.600 3.8351E-08
        0.650 5.1986E-08
        0.700 4.4743E-08
        0.800 1.2745E-08
        0.900 1.4338E-08
        1.000 7.9617E-09
        1.200 9.5541E-09
        1.400 3.3473E-08
        1.600 5.1032E-08
        1.800 1.5844E-07
        2.000 2.8909E-07
        2.200 6.4188E-07
        2.400 1.1411E-06
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 25.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -3.76e-06 1.17e-08 -3.59e-11 8.88e-07 1.27e-09 0.308
    nd: 1.784723
    Vd: 25.683446
    glass_code: 785257
    density: 3.24 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: 1.03e-05 K<sup>-1</sup>
    dPgF: 0.0162
    climatic_resistance: 1.0
    acid_resistance: 1.0
    phosphate_resistance: 1.0
