Reflective Neutral Density Filters
Optics
• Optical densities from
Lenses
0.1 to 4
Mirrors &
Beamsplitters
• Wavelength insensitive
transmission
Prisms &
Polarizers
• Useable over 280-2000 nm
Filters
Pinholes
a wavelength range from 280 nm-2
µm. Since the attenuation mechanism
is reflection these may also be used as
effective beamsplitters.
Neutral density filters are normally
specified in terms of their optical
density which is defined as the
logarithm of the ratio of intensities
in the incident and transmitted
beams as follows:
D = log10 Io
It
Typical Spectral Response of
Inconel on Fused Silica
Optomechanics
100
Breadboards
& Rails
90
Transmission (%)
There are two ways to achieve neutral
attenuation: reflection or absorption
of the unwanted light. These Ealing
reflective filters use a layer of inconel
on a flat polished substrate. Inconel
has the property that it is neutral
over a large wavelength range. It also
adheres well and can be controllably
deposited to assure precise reflectance
and transmittance values. These filters
are supplied on fused silica substrates.
The fused silica substrates will cover
80
70
60
Mounting
Hardware
50
40
30
20
10
0
400
600
800 1000 1200 1400 1600 1800 2000 2200 2400
Mirror &
Component
Mounts
Wavelength (nm)
Manual
Micro
Positioners
Motorized
Positioners
Reflective Neutral Density Filters
OpticalTransmission
Density
(%) Specifications
Substrate: UV Fused Silica
Coating: Inconel
Dimensions Tolerance:
+0/-0.508 mm for 25.4 mm
+0/-0.813 mm for 50.8 mm
Clear Aperture: 80% of central diameter
Surface Quality: 80-50
Spectral Range: 280-2000 nm
Optical Density Tolerance:
±10% of density at 546.1 nm
www.ealingcatalog.com
25.4 mm (1”) Diameter
Catalog Number
Price US
50.8 mm (2”) Square
Catalog Number
0.179.435-6048$99.00
0.263.135-6063$99.00
0.350.135-6089$99.00
0.439.835-6105$99.00
0.531.635-6121$99.00
0.625.035-6147$99.00
0.720.035-6162$99.00
0.815.935-6188$99.00
0.912.635-6204$99.00
1.010.035-6220$99.00
1.53.2
35-6246$121.00
2.01.0
35-6261$121.00
3.00.1
35-6287$121.00
4.00.01
35-6303$121.00
US: 1-800-295-3220
Price US
35-6055$143.00
35-6071$143.00
35-6097$143.00
35-6113$143.00
35-6139$143.00
35-6154$143.00
35-6170$143.00
35-6196$143.00
35-6212$143.00
35-6238$143.00
35-6253$160.00
35-6279$160.00
35-6295$160.00
35-6311$160.00
47