07_ND Filters_827-838.qxd.P:827-838
7/23/11
4:04 PM
Page 834
Optics
▼ CHAPTERS
UV Reflective Neutral Density Filters: 200 - 1200 nm
Optical Elements
ND filters with UV fused silica substrates can be used in applications
where the wavelength of the light is as low as 200 nm. In order to
facilitate the use of these filters in the UV, the design wavelength of
the NDUV series of filters is 300 nm. While the lower limit of the
spectral range is limited by the absorption of the light by the
substrate, the upper variation in the limit is somewhat arbitrary in
that it is dependent on the opacity of the nickel coating since UV
fused silica has good transmission properties up to 2.1 µm.
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■
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■
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■
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■
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■
Spectral Filters
Substrate Material:
UV Fused Silica
Diameter: 25.0 ± 0.5 mm
(Unmounted)
Thickness: 1.0 ± 0.25 mm
(Unmounted)
Front Surface Coating:
Nickel
Optical Density Tolerance:
±5% at 300 nm
■
■
■
■
■
Clear Aperture:
90% of Diameter
Surface Quality:
40-20 Scratch-Dig
Surface Flatness:
<5λ @ 633 nm
Over Diameter
Parallelism: <3 arcmin
Operating Temperature:
<100 ºC
Optical density (OD) is defined by OD = log10 (1/T) or alternatively,
T = 10-OD where T is the transmittance. Note that when defined this
way, the optical density is synonymous with absorbance.
The graphs below have a series of plots that show the typical
performance of the ND filters from 200 to 2100 nm. Although these
are reflective ND filters, the Inconel coating does absorb some of the
incident light, which limits the use of these filters to low-power
applications. Custom coatings can be optimized for any design
wavelength and alternate sizes are available. Please contact Thorlabs’
technical support for details.
ND Filters
UV Metallic Neutral Density Filters
Beamsplitters
UV Metallic Neutral Density Filters
0° AOI
100
2.5
80
2.0
0° AOI
0.1
0.2
0.3
0.4
0.5
0.6
1.0
Windows
Diffusers
% Transmission
Gratings
60
40
20
0
300
600
900
1200
1500
1800
2100
Wavelength (nm)
Please contact
your local
Thorlabs office
for custom
optical scans.
Unmounted, Ø25.0 mm UV Metallic ND Filters
ITEM #
NDUV01B
NDUV02B
NDUV03B
NDUV04B
NDUV05B
NDUV06B
NDUV10B
NDUV20B
NDUV30B
NDUV40B
$
$
$
$
$
$
$
$
$
$
$
45.00
45.00
45.00
45.00
45.00
45.00
45.00
55.00
55.00
55.00
£
£
£
£
£
£
£
£
£
£
£
32.40
32.40
32.40
32.40
32.40
32.40
32.40
39.60
39.60
39.60
€
€
€
€
€
€
€
€
€
€
€
39,15
39,15
39,15
39,15
39,15
39,15
39,15
47,85
47,85
47,85
¥
¥
¥
¥
¥
¥
¥
¥
¥
¥
RMB
OPTICAL DENSITY
358.65
358.65
358.65
358.65
358.65
358.65
358.65
438.35
438.35
438.35
0.1
0.2
0.3
0.4
0.5
0.6
1.0
2.0
3.0
4.0
SM1-Mounted, Ø25.0 mm UV Metallic ND Filters
ITEM #
NDUV01A
NDUV02A
NDUV03A
NDUV04A
NDUV05A
NDUV06A
NDUV10A
NDUV20A
NDUV30A
NDUV40A
834
$
$
$
$
$
$
$
$
$
$
$
57.00
57.00
57.00
57.00
57.00
57.00
57.00
68.00
68.00
68.00
www.thorlabs.com
£
£
£
£
£
£
£
£
£
£
£
41.04
41.04
41.04
41.04
41.04
41.04
41.04
48.96
48.96
48.96
RMB
€
€
€
€
€
€
€
€
€
€
€
49,59
49,59
49,59
49,59
49,59
49,59
49,59
59,16
59,16
59,16
¥
¥
¥
¥
¥
¥
¥
¥
¥
¥
454.29
454.29
454.29
454.29
454.29
454.29
454.29
541.96
541.96
541.96
OPTICAL DENSITY
0.1
0.2
0.3
0.4
0.5
0.6
1.0
2.0
3.0
4.0
% Transmission
Prisms
2.0
3.0
4.0
1.5
1.0
0.5
0.0
300
600
900
1200
1500
1800
2100
Wavelength (nm)
1.0 mm
(0.04")
Ø25 mm
(Ø0.98")
Unmounted ND Filter
0.45"
(11.4 mm)
SM1 (Ø1.035"-40)
External Thread
Ø0.95"
(Ø24.1 mm)
ND Filter
SM1 (Ø1.035"-40)
Internal Thread
Ø1.20"
(Ø30.5 mm)
Ø0.12"
(Ø3 mm)
Mounted ND Filter
Please refer to our website for complete models and drawings.