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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    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]