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9 / 192018-08-16 | Document No.: AN097
Figure 8: Spectrum of the SFH 4780S (black line) with FWHM = 30 nm, centered
around λ
centroid
. Total optical power accumulated from low wavelength up to the actual
filter cut-off wavelength is indicated by the dark blue line (ideal shortpass filter). The
light blue line indicates the total optical power accumulated down to the actual filter
cut-off wavelength (ideal longpass filter). To transmit e.g. 75 % of total optical energy
an optical shortpass filter can cut-off λ
cut-off-upper
= λ
centroid
+ 9 nm (not considering
filter losses)
Figure 9: Spectrum of the SFH 4780S (black line) with FWHM = 42 nm, centered
around λ
centroid
. Total optical power accumulated from low wavelength up to the actual
filter cut-off wavelength is indicated by the dark blue line (ideal shortpass filter). The
light blue line indicates the total optical power accumulated down to the actual filter
cut-off wavelength (ideal longpass filter). To transmit e.g. 75 % of total optical energy
and optical shortpass filter can cut-off at λ
cut-off-upper
=λ
centroid
+12 nm (not considering
filter losses)
Wavelength range [nm]
Percentage of total power [%]
0.6
0.4
0
-40 -30 0 10 20
1.0
0.8
0.2
-20 -10 30
Cumulated total optical power [%]
60
40
0
100
80
20
Wavelength range [nm]
Percentage of total power [%]
0.6
0.4
0
-40 -30 0 10 20
1.0
0.8
0.2
-20 -10 30
Cumulated total optical power [%]
60
40
0
100
80
20