Beamsplitting coatings
Beamsplitting coatings are intended for splitting of a falling light beam on reflected and transmitted beams, with the given ratio of intensity. ELAN makes beamsplitting coatings on the basis of refractory oxides with low absorption. Usually an angle of incidence to the surface of beamsplitting coatings varies from 0 ° up to 45 °.
Standard beamsplitting coatings have the following parameters:
R |
T |
10 ± 2% |
90 ± 2 % |
20 ± 2% |
80 ± 2 % |
30 ± 3 % |
70 ± 3 % |
40 ± 3 % |
60 ± 3 % |
50 ± 3 % |
50 ± 3 % |
60 ± 3 % |
40 ± 3 % |
66 ± 3 % |
33 ± 3 % |
70 ± 3 % |
30 ± 3 % |
80 ± 2 % |
20 ± 2 % |
90 ± 2 % |
10 ± 2 % |
95 ± 1% |
5 ± 1 % |
Standard wavelengths are: 532 nm, 633 nm, 780 nm, 1060 nm, 1550 nm.
The examples of typical beamsplitting coatings are shown on the figures below:
Fig. 1, Beamsplitting coating, R=40% at 1500 – 1600 nm, AOI = 0°
Fig. 2, Beamsplitting coating, R=80% at 1500 – 1600 nm, AOI = 0°
Fig. 3, Beamsplitting coating, R=95% at 1550 nm, AOI = 0°
Elan developed beamsplitting coatings for wide wavelength range. For example, the spectral curve of beamsplitting coating for a 350 - 950 nm wavelength range for an angle of incidence 45 ° is shown on figure 4.
Fig. 4 Beamsplitting coating for 350 – 950 nm, AOI = 45°
The spectral curve of standard 50 % beamsplitting coating for a range 450 - 650 nm for an angle of incidence 0° is shown on figure 5.
Fig. 5, Beamsplitting coating for 450 – 650 nm, AOI = 0°
The spectral characteristics of standard 50 % beamsplitting coatings for a range 450 - 650 nm for an angle of incidence 45° is shown on figures 6 and 7.
Fig. 6 Beamsplitting coating for 450 – 650 nm, R= 50%, AOI = 0°
Fig. 7 Beamsplitting coating for 450 – 650 nm, R= 50%, AOI = 0° |
