
376 OPTICS FOR ENGINEERS
200 400 600 800
0
200
400
(A)
0
0.0
0.0
400
(C)
600 800
0
0.5
1
λ, Wavelength, nm
R, Reflectivity
18 layers
400
(D)
600 800
0
50
100
λ, Wavelength, nm
Input and output
SMF = 0.67198
Fluorescein spectra
Absorption − − −
Emission —
f
λ
(λ), Spectral fraction, − · −
Filter
Blue
Green
Detector
(B) Layout
Filter reflection
R (λ)
Product
f
λ
(λ), spectral fraction, − · −
R(λ) f
λ
(λ), product, —
Figure 12.6 Spectral matching factor. Relative absorption and emission spectra of fluorescein
are shown (A). The absorption spectrum is the dashed curve, and the emission spectrum is the
small solid curve. Units are arbitrary, and scaled to a maximum value of 100% at the blue ...