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BG39

BG39

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.

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*product image is exemplary.

Spectral values guaranteed
τi (350nm) ≥0.6
τi (405nm) ≥0.85
τi (514nm) ≥0.93
τi (633nm) ≤0.3
τi (694nm) ≤0.03
τi (1060nm) ≤0.001

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

SCHOTT
BG39 - BG39
Thickness
1.0
Reflection factor
0.9135
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 0.042
330 0.256
340 0.494
350 0.647
360 0.732
370 0.783
380 0.818
390 0.845
400 0.867
410 0.886
420 0.902
430 0.917
440 0.929
450 0.939
460 0.948
470 0.956
480 0.963
490 0.967
λ [nm]
500 0.970
510 0.970
520 0.967
530 0.957
540 0.941
550 0.914
560 0.874
570 0.820
580 0.751
590 0.668
600 0.575
610 0.476
620 0.378
630 0.287
640 0.207
650 0.142
660 0.092
670 0.057
680 0.034
690 0.019
700 0.010
710 0.005
720 0.003
730 0.001
740 < 10⁻³
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 < 10⁻³
1,150 0.001
1,160 0.001
1,170 0.002
1,180 0.002
1,190 0.002
1,200 0.003
1,250 0.007
1,300 0.020
1,350 0.038
1,400 0.070
1,450 0.121
1,500 0.184
1,550 0.262
1,600 0.344
1,650 0.431
1,700 0.510
1,750 0.586
1,800 0.646
1,850 0.697
1,900 0.740
1,950 0.783
2,000 0.810
2,050 0.836
2,100 0.856
2,150 0.869
λ [nm]
2,200 0.866
2,250 0.859
2,300 0.860
2,350 0.860
2,400 0.860
2,450 0.853
2,500 0.820
2,550 0.758
2,600 0.740
2,650 0.714
2,700 0.690
2,750 0.592
2,800 0.330
2,850 0.136
2,900 0.070
2,950 0.036
3,000 0.020
3,050 0.011
3,100 0.006
3,150 0.003
3,200 0.002
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 0.002
3,800 0.002
3,850 0.002
3,900 0.002
3,950 0.001
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 0.001
4,700 0.002
4,750 0.002
4,800 0.003
4,850 0.003
4,900 0.003
4,950 0.003
5,000 0.003
5,050 0.003
5,100 0.004
5,150 0.004
Reflection factor
Pd 0.914
Reference thickness
d [mm] 1
Spectral values guaranteed
τi (350nm) ≥0.6
τi (405nm) ≥0.85
τi (514nm) ≥0.93
τi (633nm) ≤0.3
τi (694nm) ≤0.03
τi (1060nm) ≤0.001
Refractive Indices n
nh (404.7 nm) = 1.550
nd (587.6 nm) = 1.540

Colorimetric evaluation

Illuminant A(Planck T = 2347K)
d [mm] 1 2 3
x 0.365 0.314 0.279
y 0.434 0.445 0.450
Y 66 53 45
λd [nm] 500 500 499
Pe 0.19 0.31 0.39
Illuminant Planck T = 3200 K
d [mm] 1 2 3
x 0.344 0.296 0.264
y 0.419 0.425 0.427
Y 67 55 47
λd [nm] 498 498 497
Pe 0.19 0.31 0.39
Illuminant D65 (TC = 6504 K)
d [mm] 1 2 3
x 0.257 0.226 0.207
y 0.326 0.322 0.318
Y 73 62 55
λd [nm] 491 490 490
Pe 0.21 0.32 0.39
Density
p [g/cm3] 2.74
Bubble content
Bubble class 2
Transformation temperature
Tg [°C] 322
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] 11.6
α20°C/300°C [10-6/K]
α20°C/200°C [10-6/K] 13.1