BG40

BG40

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

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*product image is exemplary.

Spectral values guaranteed
τi (350nm) ≥0.8
τi (405nm) ≥0.93
τi (514nm) ≥0.97
τi (633nm) ≤0.57
τi (694nm) ≤0.16
τi (1060nm) ≤0.02

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

SCHOTT
BG40 - BG40
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 0.026
320 0.356
330 0.686
340 0.832
350 0.894
360 0.923
370 0.938
380 0.947
390 0.954
400 0.959
410 0.964
420 0.967
430 0.970
440 0.972
450 0.975
460 0.977
470 0.979
480 0.981
490 0.982
λ [nm]
500 0.982
510 0.981
520 0.979
530 0.974
540 0.967
550 0.956
560 0.939
570 0.915
580 0.882
590 0.840
600 0.788
610 0.726
620 0.657
630 0.581
640 0.503
650 0.424
660 0.349
670 0.279
680 0.217
690 0.165
700 0.123
710 0.089
720 0.064
730 0.046
740 0.032
750 0.023
760 0.016
770 0.011
780 0.008
790 0.006
λ [nm]
800 0.004
810 0.003
820 0.003
830 0.002
840 0.002
850 0.002
860 0.002
870 0.002
880 0.002
890 0.002
900 0.002
910 0.002
920 0.002
930 0.002
940 0.002
950 0.003
960 0.003
970 0.003
980 0.004
990 0.004
1,000 0.005
1,010 0.005
1,020 0.006
1,030 0.006
1,040 0.007
1,050 0.008
1,060 0.009
1,070 0.011
1,080 0.012
1,090 0.014
λ [nm]
1,100 0.015
1,110 0.017
1,120 0.019
1,130 0.021
1,140 0.024
1,150 0.027
1,160 0.031
1,170 0.033
1,180 0.037
1,190 0.041
1,200 0.046
1,250 0.074
1,300 0.120
1,350 0.176
1,400 0.240
1,450 0.319
1,500 0.400
1,550 0.482
1,600 0.560
1,650 0.626
1,700 0.680
1,750 0.718
1,800 0.750
1,850 0.774
1,900 0.794
1,950 0.805
2,000 0.812
2,050 0.812
2,100 0.810
2,150 0.808
λ [nm]
2,200 0.794
2,250 0.771
2,300 0.760
2,350 0.747
2,400 0.740
2,450 0.727
2,500 0.703
2,550 0.641
2,600 0.608
2,650 0.581
2,700 0.540
2,750 0.436
2,800 0.170
2,850 0.042
2,900 0.015
2,950 0.006
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) ≥0.97
τi (633nm) ≤0.57
τi (694nm) ≤0.16
τi (1060nm) ≤0.02
Refractive Indices n
nF (486.1 nm) = 1.536
ng (435.8 nm) = 1.540
ns (852.1 nm) = 1.523
ne (546.1 nm) = 1.532
nd (587.6 nm) = 1.530

Colorimetric evaluation

Illuminant A(Planck T = 2347K)
d [mm] 1 2 3
x 0.406 0.374 0.348
y 0.421 0.430 0.436
Y 78 68 61
λd [nm] 501 500 500
Pe 0.09 0.17 0.23
Illuminant Planck T = 3200 K
d [mm] 1 2 3
x 0.383 0.352 0.327
y 0.409 0.415 0.419
Y 79 70 63
λd [nm] 499 498 498
Pe 0.10 0.17 0.23
Illuminant D65 (TC = 6504 K)
d [mm] 1 2 3
x 0.283 0.262 0.246
y 0.327 0.324 0.321
Y 82 75 69
λd [nm] 491 490 490
Pe 0.11 0.19 0.25
Density
p [g/cm3] 2.74
Bubble content
Bubble class 2
Transformation temperature
Tg [°C] 313
Temperature coefficient
Tk [nm/°C]
Chemical Resistance
FR class 0
SR class 5.1
AR class 3.0
Thermal expansion
α-30°C/+70°C [10-6/K] 11.9
α20°C/300°C [10-6/K]
α20°C/200°C [10-6/K] 13.7