# 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/sumita_2017-02-02.agf\">SUMITA Zemax catalog 2017-02-02</a> (obtained from <a href=\"http://www.sumita-opt.co.jp/en/download/\">http://www.sumita-opt.co.jp</a>)<br>See also <a href=\"http://refractiveindex.info/download/data/2016/sumita_2016-02-01.pdf\">SUMITA optical glass data book</a>"
DATA:
  - type: formula 3 
    range: 0.36 1.55
    coefficients: 2.969235 -0.01236657 2 0.024178838 -2 0.00087063153 -4 -4.4196612e-05 -6 4.4742987e-06 -8
  - type: tabulated k
    data: |
        0.340 9.7725E-06
        0.350 3.5554E-06
        0.360 1.4349E-06
        0.370 6.7548E-07
        0.380 3.7970E-07
        0.390 2.4196E-07
        0.400 1.7334E-07
        0.420 1.1216E-07
        0.440 9.2241E-08
        0.460 8.1431E-08
        0.480 6.9381E-08
        0.500 6.0135E-08
        0.550 4.3988E-08
        0.600 3.8351E-08
        0.650 3.1129E-08
        0.700 1.6736E-08
        0.800 1.2745E-08
        1.060 1.6887E-08
        1.500 2.3897E-08
        2.000 4.1928E-07
SPECS:
    n_is_absolute: false
    λ_is_vacuum: false
    temperature: 20.0 °C
    coefficients_of_thermal_dispersion: -1.89e-06 1.65e-08 -4.35e-11 6.29e-07 6.76e-10 0.223
    n_d: 1.74400
    V_d: 44.9
    glass_code: 744449
    density: 4.01 g/cm<sup>3</sup>
    coefficient_of_thermal_expansion_1: 7.3e-06 K<sup>-1</sup>
    coefficient_of_thermal_expansion_2: 8.6e-06 K<sup>-1</sup>
    ΔP_gF: -0.0038
    climatic_resistance: 1.0
    acid_resistance: 4.0
