# 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 1.68915108 0.0128202514 0.290462024 0.0618090841 2.37971516 201.094352
  - type: tabulated k
    data: |
        0.370 6.7797E-06
        0.380 2.5521E-06
        0.390 1.1069E-06
        0.400 5.5498E-07
        0.420 2.2821E-07
        0.440 1.4293E-07
        0.460 1.0773E-07
        0.480 8.8880E-08
        0.500 6.8222E-08
        0.550 3.0745E-08
        0.600 3.3540E-08
        0.650 5.1986E-08
        0.700 4.4743E-08
        0.800 1.9127E-08
        0.900 7.1656E-09
        1.000 7.9617E-09
        1.200 9.5541E-09
        1.400 3.3473E-08
        1.600 5.1032E-08
        1.800 1.7293E-07
        2.000 2.8909E-07
        2.200 6.9645E-07
        2.400 1.1411E-06
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 25.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -2.83e-06 1.27e-08 -3.36e-11 8.35e-07 1.16e-09 0.31
    nd: 1.761821
    Vd: 26.517885
    glass_code: 762265
    density: 3.17 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 8.7e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 1e-05 K<sup>-1</sup>
    dPgF: 0.015
    climatic_resistance: 2.0
    acid_resistance: 1.0
    phosphate_resistance: 1.0
