BG38

BG38

A NIR cutoff filter with a high steepness of NIR cutoff.

Find more information in the tabs below or on our website.

Use our Interactive Filter Diagram to compare this filter or download our Filter Calculation Tool.

For customized filter products you can mark an article and use the request-button.

*product image is exemplary.

Spectral values guaranteed
τi (350nm) ≥0.8
τi (405nm) ≥0.93
τi (514nm) ≥0.95
τi (633nm) ≤0.67
τi (694nm) ≤0.32
τi (1060nm) ≤0.06

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

SCHOTT
BG38 - BG38
Thickness
1.0
Reflection factor
0.9159
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 0.114
320 0.487
330 0.718
340 0.829
350 0.881
360 0.908
370 0.924
380 0.936
390 0.946
400 0.953
410 0.959
420 0.963
430 0.968
440 0.972
450 0.975
460 0.977
470 0.980
480 0.982
490 0.983
λ [nm]
500 0.984
510 0.983
520 0.981
530 0.978
540 0.970
550 0.959
560 0.943
570 0.921
580 0.891
590 0.854
600 0.811
610 0.760
620 0.704
630 0.644
640 0.581
650 0.518
660 0.456
670 0.397
680 0.341
690 0.289
700 0.243
710 0.203
720 0.168
730 0.139
740 0.115
750 0.095
760 0.078
770 0.066
780 0.055
790 0.047
λ [nm]
800 0.040
810 0.035
820 0.031
830 0.028
840 0.025
850 0.023
860 0.022
870 0.021
880 0.020
890 0.020
900 0.020
910 0.020
920 0.020
930 0.021
940 0.022
950 0.024
960 0.025
970 0.027
980 0.028
990 0.030
1,000 0.032
1,010 0.034
1,020 0.037
1,030 0.040
1,040 0.043
1,050 0.046
1,060 0.049
1,070 0.053
1,080 0.057
1,090 0.061
λ [nm]
1,100 0.066
1,110 0.071
1,120 0.075
1,130 0.081
1,140 0.086
1,150 0.093
1,160 0.099
1,170 0.104
1,180 0.111
1,190 0.120
1,200 0.126
1,250 0.172
1,300 0.228
1,350 0.293
1,400 0.360
1,450 0.433
1,500 0.510
1,550 0.577
1,600 0.640
1,650 0.700
1,700 0.744
1,750 0.778
1,800 0.800
1,850 0.825
1,900 0.840
1,950 0.849
2,000 0.855
2,050 0.855
2,100 0.853
2,150 0.848
λ [nm]
2,200 0.821
2,250 0.797
2,300 0.790
2,350 0.791
2,400 0.790
2,450 0.776
2,500 0.730
2,550 0.657
2,600 0.610
2,650 0.579
2,700 0.520
2,750 0.385
2,800 0.080
2,850 0.014
2,900 0.005
2,950 0.003
3,000 0.002
3,050 < 10⁻³
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 < 10⁻³
3,750 < 10⁻³
3,800 < 10⁻³
3,850 < 10⁻³
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
Reflection factor
Pd 0.916
Reference thickness
d [mm] 1
Spectral values guaranteed
τi (350nm) ≥0.8
τi (405nm) ≥0.93
τi (514nm) ≥0.95
τi (633nm) ≤0.67
τi (694nm) ≤0.32
τi (1060nm) ≤0.06
Refractive Indices n
nh (404.7 nm) = 1.540
nd (587.6 nm) = 1.530

Colorimetric evaluation

Illuminant A(Planck T = 2347K)
d [mm] 1 2 3
x 0.413 0.384 0.360
y 0.419 0.427 0.433
Y 80 71 64
λd [nm] 501 500 500
Pe 0.08 0.14 0.20
Illuminant Planck T = 3200 K
d [mm] 1 2 3
x 0.390 0.362 0.339
y 0.407 0.413 0.417
Y 80 72 65
λd [nm] 499 498 498
Pe 0.08 0.15 0.21
Illuminant D65 (TC = 6504 K)
d [mm] 1 2 3
x 0.288 0.268 0.253
y 0.328 0.326 0.323
Y 83 76 71
λd [nm] 491 491 490
Pe 0.09 0.16 0.22
Density
p [g/cm3] 2.66
Bubble content
Bubble class 2
Transformation temperature
Tg [°C] 482
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] 7.5
α20°C/300°C [10-6/K] 8.9
α20°C/200°C [10-6/K]