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    BG18

    Longpass filters provide cut-on wavelengths in the ultra-violet (UV), visible, or near-infrared (NIR) spectra. The color glass substrates feature high spectral transmittance within their wavelength ranges. .

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    BG18
    Spectral values guaranteed
    τi (350nm) ≥0.3
    τi (405nm) ≥0.65
    τi (514nm) ≥0.88
    τi (633nm) ≤0.25
    τi (694nm) ≤0.03
    τi (1060nm) ≤0.0005
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    SCHOTT Article
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      Download Data sheet BG18
      Article Details
       
      Technical Details
      Internal Transmittance (Chart)

      Only values between 1 and 30 with one decimal place are allowed.

      Lambda [nm]
      200
      300
      400
      500
      600
      700
      800
      900
      1000
      1100
      1200
      1E-5
      1E-4
      1E-3
      0.01
      0.05
      0.1
      0.2
      0.3
      0.4
      0.5
      0.6
      0.7
      0.8
      0.9
      0.95
      0.96
      0.97
      0.98
      0.99
      SCHOTT
      BG18 - BG18
      Thickness
      1.0
      Reflection factor
      0.9150
      Internal Transmittance (Table)
      λ [nm]
      200 < 10⁻³
      210 < 10⁻³
      220 < 10⁻³
      230 < 10⁻³
      240 < 10⁻³
      250 < 10⁻³
      260 < 10⁻³
      270 < 10⁻³
      280 < 10⁻³
      290 < 10⁻³
      300 < 10⁻³
      310 < 10⁻³
      320 0.033
      330 0.156
      340 0.305
      350 0.416
      360 0.497
      370 0.552
      380 0.603
      390 0.643
      400 0.682
      410 0.719
      420 0.751
      430 0.780
      440 0.806
      450 0.830
      460 0.853
      470 0.872
      480 0.885
      490 0.899
      λ [nm]
      500 0.911
      510 0.916
      520 0.915
      530 0.908
      540 0.892
      550 0.863
      560 0.819
      570 0.761
      580 0.686
      590 0.600
      600 0.506
      610 0.411
      620 0.322
      630 0.242
      640 0.175
      650 0.122
      660 0.082
      670 0.053
      680 0.033
      690 0.020
      700 0.012
      710 0.007
      720 0.004
      730 0.002
      740 0.001
      750 < 10⁻³
      760 < 10⁻³
      770 < 10⁻³
      780 < 10⁻³
      790 < 10⁻³
      λ [nm]
      800 < 10⁻³
      810 < 10⁻³
      820 < 10⁻³
      830 < 10⁻³
      840 < 10⁻³
      850 < 10⁻³
      860 < 10⁻³
      870 < 10⁻³
      880 < 10⁻³
      890 < 10⁻³
      900 < 10⁻³
      910 < 10⁻³
      920 < 10⁻³
      930 < 10⁻³
      940 < 10⁻³
      950 < 10⁻³
      960 < 10⁻³
      970 < 10⁻³
      980 < 10⁻³
      990 < 10⁻³
      1,000 < 10⁻³
      1,010 < 10⁻³
      1,020 < 10⁻³
      1,030 < 10⁻³
      1,040 < 10⁻³
      1,050 < 10⁻³
      1,060 < 10⁻³
      1,070 < 10⁻³
      1,080 < 10⁻³
      1,090 < 10⁻³
      λ [nm]
      1,100 < 10⁻³
      1,110 < 10⁻³
      1,120 < 10⁻³
      1,130 < 10⁻³
      1,140 0.001
      1,150 0.001
      1,160 0.002
      1,170 0.002
      1,180 0.002
      1,190 0.003
      1,200 0.003
      1,250 0.007
      1,300 0.018
      1,350 0.033
      1,400 0.060
      1,450 0.096
      1,500 0.150
      1,550 0.214
      1,600 0.280
      1,650 0.359
      1,700 0.436
      1,750 0.502
      1,800 0.560
      1,850 0.619
      1,900 0.660
      1,950 0.707
      2,000 0.743
      2,050 0.763
      2,100 0.781
      2,150 0.789
      λ [nm]
      2,200 0.777
      2,250 0.769
      2,300 0.770
      2,350 0.785
      2,400 0.790
      2,450 0.786
      2,500 0.760
      2,550 0.726
      2,600 0.680
      2,650 0.648
      2,700 0.596
      2,750 0.426
      2,800 0.070
      2,850 0.011
      2,900 0.004
      2,950 0.002
      3,000 0.001
      3,050 0.001
      3,100 < 10⁻³
      3,150 < 10⁻³
      3,200 < 10⁻³
      3,250 < 10⁻³
      3,300 < 10⁻³
      3,350 < 10⁻³
      3,400 < 10⁻³
      3,450 < 10⁻³
      3,500 < 10⁻³
      3,550 < 10⁻³
      3,600 < 10⁻³
      3,650 < 10⁻³
      λ [nm]
      3,700 0.001
      3,750 0.001
      3,800 0.001
      3,850 0.001
      3,900 < 10⁻³
      3,950 < 10⁻³
      4,000 < 10⁻³
      4,050 < 10⁻³
      4,100 < 10⁻³
      4,150 < 10⁻³
      4,200 < 10⁻³
      4,250 < 10⁻³
      4,300 < 10⁻³
      4,350 < 10⁻³
      4,400 < 10⁻³
      4,450 < 10⁻³
      4,500 < 10⁻³
      4,550 < 10⁻³
      4,600 < 10⁻³
      4,650 < 10⁻³
      4,700 < 10⁻³
      4,750 < 10⁻³
      4,800 < 10⁻³
      4,850 < 10⁻³
      4,900 < 10⁻³
      4,950 < 10⁻³
      5,000 < 10⁻³
      5,050 < 10⁻³
      5,100 < 10⁻³
      5,150 < 10⁻³
      Optical values
      Reflection factor
      Pd 0.915
      Reference thickness
      d [mm] 1
      Spectral values guaranteed
      τi (350nm) ≥0.3
      τi (405nm) ≥0.65
      τi (514nm) ≥0.88
      τi (633nm) ≤0.25
      τi (694nm) ≤0.03
      τi (1060nm) ≤0.0005
      Refractive Indices n
      nF (486.1 nm) = 1.539
      nh (404.7 nm) = 1.546
      ng (435.8 nm) = 1.543
      ns (852.1 nm) = 1.528
      ne (546.1 nm) = 1.536
      nd (587.6 nm) = 1.534
      Colorimetric evaluation
      Illuminant A(Planck T = 2347K)
      d [mm] 1 2 3
      x 0.361 0.309 0.275
      y 0.441 0.459 0.472
      Y 61 46 37
      λd [nm] 502 501 501
      Pe 0.20 0.31 0.39
      Illuminant Planck T = 3200 K
      d [mm] 1 2 3
      x 0.340 0.292 0.260
      y 0.426 0.441 0.451
      Y 62 48 38
      λd [nm] 500 500 500
      Pe 0.20 0.32 0.39
      Illuminant D65 (TC = 6504 K)
      d [mm] 1 2 3
      x 0.255 0.225 0.206
      y 0.335 0.340 0.346
      Y 68 54 45
      λd [nm] 493 493 493
      Pe 0.21 0.31 0.38
      Physical values
      Density
      p [g/cm3] 2.6751
      Bubble content
      Bubble class 2
      Transformation temperature
      Tg [°C] 457
      Temperature coefficient
      Tk [nm/°C]
      Chemical Resistance
      FR class 0
      SR class 2.0
      AR class 2.0
      Thermal expansion
      α-30°C/+70°C [10-6/K] 7.44
      α20°C/300°C [10-6/K] 8.88
      α20°C/200°C [10-6/K]
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