BG61

BG61

A NIR cutoff filter with high humidity resistance.

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*product image is exemplary.

Spectral values guaranteed
τi (405nm) ≥0.84
τi (514nm) ≥0.93
τi (633nm) ≥0.18
τi (694nm) ≤0.03
τi (1060nm) ≤0.008
Download Data sheet
Glass type
 Article L
 W
 T
 Weight

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

SCHOTT
BG61 - BG61
Thickness
1.0
Reflection factor
0.9150
λ [nm]
200
210
220
230
240
250
260
270
280
290
300
310
320 < 10⁻³
330 0.038
340 0.222
350 0.487
360 0.687
370 0.801
380 0.858
390 0.890
400 0.910
410 0.923
420 0.932
430 0.940
440 0.948
450 0.954
460 0.960
470 0.964
480 0.966
490 0.967
λ [nm]
500 0.966
510 0.961
520 0.952
530 0.933
540 0.900
550 0.860
560 0.808
570 0.742
580 0.663
590 0.577
600 0.485
610 0.395
620 0.311
630 0.236
640 0.174
650 0.125
660 0.086
670 0.059
680 0.038
690 0.025
700 0.016
710 0.010
720 0.007
730 0.005
740 0.003
750 0.002
760 0.001
770 0.001
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 0.001
980 0.001
990 0.002
1,000 0.002
1,010 0.002
1,020 0.003
1,030 0.003
1,040 0.004
1,050 0.004
1,060 0.005
1,070 0.006
1,080 0.007
1,090 0.008
λ [nm]
1,100 0.009
1,110 0.010
1,120 0.012
1,130 0.014
1,140 0.016
1,150 0.018
1,160 0.021
1,170 0.024
1,180 0.027
1,190 0.030
1,200 0.034
1,250 0.060
1,300 0.098
1,350 0.147
1,400 0.211
1,450 0.280
1,500 0.353
1,550 0.429
1,600 0.499
1,650 0.566
1,700 0.625
1,750 0.677
1,800 0.721
1,850 0.759
1,900 0.790
1,950 0.817
2,000 0.838
2,050 0.856
2,100 0.872
2,150 0.883
λ [nm]
2,200 0.890
2,250 0.895
2,300 0.899
2,350 0.904
2,400 0.908
2,450 0.909
2,500 0.906
2,550 0.906
2,600 0.900
2,650 0.895
2,700 0.885
2,750 0.862
2,800 0.774
2,850 0.639
2,900 0.529
2,950 0.450
3,000 0.389
3,050 0.337
3,100 0.290
3,150 0.249
3,200 0.214
3,250 0.187
3,300 0.166
3,350 0.150
3,400 0.139
3,450 0.133
3,500 0.131
3,550 0.136
3,600 0.143
3,650 0.155
λ [nm]
3,700 0.172
3,750 0.189
3,800 0.197
3,850 0.189
3,900 0.167
3,950 0.140
4,000 0.105
4,050 0.064
4,100 0.034
4,150 0.017
4,200 0.010
4,250 0.007
4,300 0.007
4,350 0.008
4,400 0.008
4,450 0.006
4,500 0.005
4,550 0.005
4,600 0.005
4,650 0.007
4,700 0.011
4,750 0.017
4,800 0.026
4,850 0.035
4,900 0.045
4,950 0.058
5,000 0.073
5,050 0.086
5,100 0.096
5,150 0.099
Reflection factor
Pd 0.915
Reference thickness
d [mm] 1
Spectral values guaranteed
τi (405nm) ≥0.84
τi (514nm) ≥0.93
τi (633nm) ≥0.18
τi (694nm) ≤0.03
τi (1060nm) ≤0.008
Refractive Indices n
nF (486.1 nm) = 1.541
nh (404.7 nm) = 1.549
ng (435.8 nm) = 1.545
ns (852.1 nm) = 1.528
ne (546.1 nm) = 1.537
nd (587.6 nm) = 1.535

Colorimetric evaluation

Illuminant A(Planck T = 2347K)
d [mm] 1 2 3
x 0.349 0.289 0.250
y 0.432 0.438 0.435
Y 60 46 37
λd [nm] 499 498 497
Pe 0.22 0.37 0.46
Illuminant Planck T = 3200 K
d [mm] 1 2 3
x 0.328 0.272 0.236
y 0.415 0.416 0.410
Y 62 48 39
λd [nm] 497 496 495
Pe 0.23 0.37 0.47
Illuminant D65 (TC = 6504 K)
d [mm] 1 2 3
x 0.245 0.210 0.189
y 0.319 0.307 0.296
Y 68 55 47
λd [nm] 490 489 488
Pe 0.25 0.39 0.48
Density
p [g/cm3] 2.8064
Bubble content
Bubble class
Transformation temperature
Tg [°C] 402
Temperature coefficient
Tk [nm/°C]
Chemical Resistance
FR class 1
SR class 52.3
AR class 3.3
Thermal expansion
α-30°C/+70°C [10-6/K] 11.94
α20°C/300°C [10-6/K] 13.85
α20°C/200°C [10-6/K]
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