Infrared Neutral Density Filters

Attenuate IR radiation from 2 to 14 µm (optimized for 2 to 5 µm)
Spectrally neutral throughout usable range
Precision Germanium substrate

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Overview
Specifications
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Optimized for 2 to 5 µm, these filters attenuate IR radiation from 2 to 14 µm. These one-inch diameter filters are made from germanium substrates coated with a spectrally neutral vacuum deposited metal alloy reflective coating.

Specifications

Material	Optical grade germanium or equivalent
Coating	Vacuum deposited metal alloy
Diameter	1.0 (25.4)±0.2 mm
Clear Aperture	All but 1.5 mm outer rim
Surface Quality	See Table Below
Thickness	mm
Parallelism	See Table Below
Wavelength Range	2 to 14 µm (optimized for 2 to 5 µm)

Infrared Neutral Density Filters Table

Model	Surface Quality (scratch-dig)	Parallelism	Optical Density	Transmittance	Transmittance Tolerance (+/-%)
FIR-ND03	80-50	3 to 5 arc min (0.8 to 1.5 mrad)	0.3	50%	3.0%
FIR-ND06	80-50	3 to 5 arc min (0.8 to 1.5 mrad)	0.6	25%	2.0%
FIR-ND10	80-50	3 to 5 arc min (0.8 to 1.5 mrad)	1.0	10%	1.5%
FIR-ND20	80-50	3 to 5 arc min (0.8 to 1.5 mrad)	2.0	1.0%	0.2%
FIR-ND30	80-50	3 to 5 arc min (0.8 to 1.5 mrad)	3.0	0.1%	0.04%
FS-IR	80-50	3 to 5 arc min (0.8 to 1.5 mrad)	Set of Infrared Neutral Density Filters
NDIR10-03	60-40	< 10 arc minute	0.3	50%	4.0
NDIR10-05	60-40	< 10 arc minute	0.5	31.62%	2.0
NDIR10-10	60-40	< 10 arc minute	1.0	10%	1.5
NDIR10-20	60-40	< 10 arc minute	2.0	1.0%	0.25
NDIR10-30	60-40	< 10 arc minute	3.0	0.1%	+0.08 / -0.05
NDIR20-03	60-40	< 10 arc minute	0.3	50%	4.0
NDIR20-05	60-40	< 10 arc minute	0.5	31.62%	2.0
NDIR20-10	60-40	< 10 arc minute	1.0	10%	1.5
NDIR20-20	60-40	< 10 arc minute	2.0	1.0%	0.25
NDIR20-30	60-40	< 10 arc minute	3.0	0.1%	+0.08 / -0.05

FIR-Series

Typical transmittance of IR ND Filters. The germanium substrate absorbs strongly below 1.8 µm.

NDIR-Series

Model	Description	avail raw	Availability	price raw	Price	Qty. MULTI ADD
FIR-ND03	Infrared Neutral Density Filter, 25.4 mm Diameter, 0.3 OD, ±3% Tolerance	0	In Stock	786	$786.00	ADD
FIR-ND06	Infrared Neutral Density Filter, 25.4 mm Diameter, 0.6 OD, ± 3% Tolerance	0	In Stock	786	$786.00	ADD
FIR-ND10	Infrared Neutral Density Filter, 25.4 mm Diameter, 1.0 OD, ±3% Tolerance	0	In Stock	786	$786.00	ADD
FIR-ND20	Infrared Neutral Density Filter, 25.4 mm Diameter, 2.0 OD, ±3% Tolerance	0	In Stock	786	$786.00	ADD
FIR-ND30	Infrared Neutral Density Filter, 25.4 mm Diameter, 3.0 OD, ±3% Tolerance	0	In Stock	786	$786.00	ADD
FS-IR	Infrared ND Filter Set, 25.4 mm Diameter, Includes: .3, .6, 1, 2 & 3 OD Filters	99	Call	3942	$3,942.00	ADD
NDIR10-03	Infrared Neutral Density Filter, 25.0 mm Diameter, 0.3 OD, ± 4.00 % Tolerance	0	In Stock	372	$372.00	ADD
NDIR10-05	Infrared Neutral Density Filter, 25.0 mm Diameter, 0.5 OD, ± 2.00 % Tolerance	3	3 Weeks	372	$372.00	ADD
NDIR10-10	Infrared Neutral Density Filter, 25.0 mm Diameter, 1.0 OD, ± 1.50 % Tolerance	0	In Stock	372	$372.00	ADD
NDIR10-20	Infrared Neutral Density Filter, 25.0 mm Diameter, 2.0 OD, ± 0.25 % Tolerance	0	In Stock	372	$372.00	ADD
NDIR10-30	Infrared Neutral Density Filter, 25.0 mm Diameter, 3.0 OD, +0.08/-0.05 % Tolerance	0	In Stock	372	$372.00	ADD
NDIR20-03	Infrared Neutral Density Filter, 50.0 mm Diameter, 0.3 OD, ± 4.00 % Tolerance	0	In Stock	750	$750.00	ADD
NDIR20-05	Infrared Neutral Density Filter, 50.0 mm Diameter, 0.5 OD, ± 2.00 % Tolerance	0	In Stock	750	$750.00	ADD
NDIR20-10	Infrared Neutral Density Filter, 50.0 mm Diameter, 1.0 OD, ± 1.50 % Tolerance	0	In Stock	750	$750.00	ADD
NDIR20-20	Infrared Neutral Density Filter, 50.0 mm Diameter, 2.0 OD, ± 0.25 % Tolerance	0	In Stock	750	$750.00	ADD
NDIR20-30	Infrared Neutral Density Filter, 50.0 mm Diameter, 3.0 OD, +0.08/-0.05 % Tolerance	0	In Stock	750	$750.00	ADD

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