Materials
4 OPTICS & MATERIALS
Singlet Lenses
ABSORPTION NEUTRAL DENSITY FILTERS
CHAPTER
Multiple Lenses
Absorption type neural filters are attain their density by absorbing light
within the substrate, whereas the metallic type attain their density by
both reflection and absorption. These filters reflect very little light. The
absorption type neutral density filter is preferred over the metallic type
since the reflections are very low. To further eliminate the possibility of
any unwanted reflected light are coated. Both surfaces of all absorbing
neutral density filters with a visible broadband anti-reflection coating.
This coating reduces the surface reflection to approximately 0.5% per
surface.
Since the glass absorbs the light within the substrate, the optical density
is very dependent upon the thickness of the substrate.
Mirrors
Etalons
Specifications
Optical density (D) is defined as the logarithm
Beam splitters
to the base 10 of the reciprocal of the transmitted radiant power(T)
D=log101/T
or T=10-D
Thickness
Dimensional Tolerances
Clear Aperture
Surface Quality
Max. Operating temperature
Substrate Material
Optical Quality
Anti-Reflection Coatings
Prisms
Polarizing
Optics
Optical
Density Tolerance
Transmission
Density
@550nm
%
0.10
±10%
79.43
5.0mm (maximum)
±0.5mm
90% of diameter
60/40 Per MIL-0-13830B
+100oC
Schott¨ absorption glass
Flatness of 3 to 5 waves per inch and
parallelism of 3 arc minutes or better
< or = 0.5% avg. per surface from 400nm to
700nm
Spectral Range
Thickness
25mmφ
50mm x 50mm
400nm-700nm
4.95mm
010ABND-25
010ABND-50S
Filters
0.20
±10%
63.10
400nm-700nm
1.91mm
020ABND-25
020ABND-50S
0.30
±10%
50.12
400nm-700nm
2.84mm
030ABND-25
030ABND-50S
0.40
±10%
39.81
400nm-700nm
3.78mm
040ABND-25
040ABND-50S
0.50
±10%
31.62
400nm-700nm
2.11mm
050ABND-25
050ABND-50S
0.60
±10%
25.12
400nm-700nm
2.54mm
060ABND-25
060ABND-50S
Gratings
0.70
±10%
19.95
400nm-700nm
2.95mm
070ABND-25
070ABND-50S
0.80
±10%
15.85
400nm-700nm
3.38mm
080ABND-25
080ABND-50S
0.90
±10%
12.59
400nm-700nm
1.75mm
090ABND-25
090ABND-50S
1.00
±10%
10.00
400nm-700nm
1.96mm
100ABND-25
100ABND-50S
Microscope
Objectives
1.50
±10%
03.16
400nm-700nm
2.90mm
150ABND-25
150ABND-50S
2.00
±10%
01.00
400nm-700nm
1.96mm
200ABND-25
200ABND-50S
3.00
±10%
00.10
400nm-700nm
2.92mm
300ABND-25
300ABND-50S
4.00
±10%
00.01
400nm-700nm
2.82mm
400ABND-25
400ABND-50S
Crystals
Photonic Crystal
Fibers
4-64
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