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BG50

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

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BG50
Spectral values guaranteed
τi (500nm) ≥0.96
τi (600nm) ≥0.68
τi (700nm) ≤0.13
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Download Data sheet BG50
Article Details
SCHOTT
Article
Glass type
L
W
T
Weight
 
Technical Details
Internal Transmittance (Chart)

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

SCHOTT
BG50 - BG50
Thickness
1.0
Reflection factor
0.9159
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 0.035
310 0.243
320 0.514
330 0.693
340 0.786
350 0.834
360 0.863
370 0.884
380 0.902
390 0.917
400 0.929
410 0.940
420 0.949
430 0.956
440 0.962
450 0.968
460 0.972
470 0.977
480 0.980
490 0.982
λ [nm]
500 0.984
510 0.984
520 0.982
530 0.977
540 0.967
550 0.952
560 0.929
570 0.897
580 0.854
590 0.801
600 0.739
610 0.669
620 0.594
630 0.517
640 0.441
650 0.369
660 0.304
670 0.245
680 0.194
690 0.152
700 0.117
710 0.089
720 0.068
730 0.052
740 0.039
750 0.030
760 0.023
770 0.018
780 0.014
790 0.012
λ [nm]
800 0.010
810 0.009
820 0.008
830 0.007
840 0.006
850 0.006
860 0.005
870 0.005
880 0.005
890 0.005
900 0.005
910 0.005
920 0.005
930 0.005
940 0.006
950 0.006
960 0.007
970 0.007
980 0.008
990 0.009
1,000 0.010
1,010 0.011
1,020 0.012
1,030 0.013
1,040 0.015
1,050 0.016
1,060 0.018
1,070 0.020
1,080 0.022
1,090 0.025
λ [nm]
1,100 0.027
1,110 0.030
1,120 0.033
1,130 0.037
1,140 0.040
1,150 0.044
1,160 0.048
1,170 0.053
1,180 0.058
1,190 0.063
1,200 0.069
1,250 0.100
1,300 0.145
1,350 0.203
1,400 0.271
1,450 0.338
1,500 0.413
1,550 0.487
1,600 0.554
1,650 0.615
1,700 0.665
1,750 0.707
1,800 0.739
1,850 0.766
1,900 0.790
1,950 0.799
2,000 0.809
2,050 0.814
2,100 0.818
2,150 0.814
λ [nm]
2,200 0.781
2,250 0.762
2,300 0.757
2,350 0.756
2,400 0.754
2,450 0.743
2,500 0.708
2,550 0.658
2,600 0.611
2,650 0.575
2,700 0.527
2,750 0.391
2,800 0.061
2,850 0.008
2,900 0.002
2,950 0.001
3,000 < 10⁻³
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 0.001
4,850 0.001
4,900 0.001
4,950 0.001
5,000 0.001
5,050 < 10⁻³
5,100 < 10⁻³
5,150 < 10⁻³
Optical values
Reflection factor
Pd 0.916
Reference thickness
d [mm] 1
Spectral values guaranteed
τi (500nm) ≥0.96
τi (600nm) ≥0.68
τi (700nm) ≤0.13
Refractive Indices n
nh (404.7 nm) = 1.550
ne (546.1 nm) = 1.540
nd (587.6 nm) = 1.530
Colorimetric evaluation
Illuminant A(Planck T = 2347K)
d [mm] 1 2 3
x 0.398 0.360 0.331
y 0.424 0.435 0.441
Y 75 65 57
λd [nm] 501 500 500
Pe 0.11 0.20 0.27
Illuminant Planck T = 3200 K
d [mm] 1 2 3
x 0.375 0.339 0.311
y 0.411 0.419 0.423
Y 76 66 59
λd [nm] 499 498 498
Pe 0.12 0.20 0.27
Illuminant D65 (TC = 6504 K)
d [mm] 1 2 3
x 0.278 0.254 0.236
y 0.328 0.325 0.323
Y 80 72 66
λd [nm] 491 491 491
Pe 0.13 0.22 0.29
Physical values
Density
p [g/cm3] 2.6116
Bubble content
Bubble class
Transformation temperature
Tg [°C] 452
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] 7.3
α20°C/300°C [10-6/K] 9
α20°C/200°C [10-6/K]
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