# 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: ""
DATA:
  - type: formula 2 
    wavelength_range: 0.3 2.4
    coefficients: 0 1.704423 0.01024939 0.1778568 0.04576819 1.425726 153.5267
  - type: tabulated k
    data: |
        0.350 7.8359E-06
        0.360 3.1761E-06
        0.370 1.4554E-06
        0.380 7.1281E-07
        0.390 3.9673E-07
        0.400 2.2416E-07
        0.420 9.8359E-08
        0.440 6.7167E-08
        0.460 4.7899E-08
        0.480 3.4533E-08
        0.500 2.3945E-08
        0.550 8.7623E-09
        0.600 9.5589E-09
        0.650 1.0355E-08
        0.700 1.1152E-08
        0.800 6.3694E-09
        0.900 1.4338E-08
        1.000 7.9617E-09
        1.200 9.5541E-09
        1.400 2.2304E-08
        1.600 2.5490E-08
        1.800 1.0062E-07
        2.400 1.5032E-06
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 25.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: 7.5415e-06 0.0 0.0 0.0 0.0 0.0
    nd: 1.720000
    Vd: 41.989859
    glass_code: 720420
    glass_status: preferred
    density: 4.26 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 6.6e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 7.7e-06 K<sup>-1</sup>
    dPgF: -0.0009
    acid_resistance: 5.2
    phosphate_resistance: 1.2
