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Fixed ND Filters (Ge)

Fixed ND Filters (Ge)

Infrared Neutral Density Filters are designed to attenuate radiation over a wide sprectral range. These filters are coated on germanium substrates. The ND coating is optimized at 2.2 microns and can be used out to 15 microns.

Custom sizes and densities are available upon request.

Click here for a custom quote.

Description Product No. Graph Price Qty / Buy / Quote
Fixed ND Filter Set (6): 25mm Dia, 0.3 - 4.0, Ge R01807-00 $1,014.00
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Substrate MaterialGermanium
Dimensions25mm Diameter ±0.2mm
Thickness1.0mm ±0.2mm
Bevel45°
Edge FinishGround
Surface Quality (SQ)60-40 Scratch & Dig
Clear Aperture (CA)90%
Centrationn/a
Surface Flatness2 Waves Per 25mm
Transmitted Wavefront Error (TWE)n/a
Parallelism< 7 Arc Minutes
CoatingMetallic ND
Wavelength2.2 to 15 µm
Calibrated Wavelength2.5 µm
Optical Density (OD)0.3, 0.6, 1.0, 2.0, 3.0, 4.0 ±5%
Operating Temperature-50° C to 100° C
Beam Deviation< 3 Arcminutes
Laser Damage<30 W/cm² CW, typical, Not recommended for Pulse Laser Use
Fixed ND Filter Set (6): 50mm Dia, 0.3 - 4.0, Ge R01867-00 $3,177.00
Add to cart
Substrate MaterialGermanium
Dimensions50mm Diameter ±0.2mm
Thickness1.0mm ±0.2mm
Bevel45°
Edge FinishGround
Surface Quality (SQ)60-40 Scratch & Dig
Clear Aperture (CA)90%
Centrationn/a
Surface Flatness2 Waves Per 25mm
Transmitted Wavefront Error (TWE)n/a
Parallelism< 7 Arc Minutes
CoatingMetallic ND
Wavelength2.2 to 15 µm
Calibrated Wavelength2.5 µm
Optical Density (OD)0.3, 0.6, 1.0, 2.0, 3.0, 4.0 ±5%
Operating Temperature-50° C to 100° C
Beam Deviation< 3 Arcminutes
Laser Damage<30 W/cm² CW, typical, Not recommended for Pulse Laser Use
Fixed ND Filter: 25mm Dia, 0.3, Ge R01801-03 Graph $135.00
Add to cart
Substrate MaterialGermanium
Dimensions25mm Diameter ±0.2mm
Thickness1.0mm ±0.2mm
Bevel45°
Edge FinishGround
Surface Quality (SQ)60-40 Scratch & Dig
Clear Aperture (CA)90%
Centrationn/a
Surface Flatness2 Waves Per 25mm
Transmitted Wavefront Error (TWE)n/a
Parallelism< 7 Arc Minutes
CoatingMetallic ND
Wavelength2.2 to 15 µm
Calibrated Wavelength2.5 µm
Optical Density (OD)0.3 ±5%
Operating Temperature-50° C to 100° C
Beam Deviation< 3 Arcminutes
Laser Damage<30 W/cm² CW, typical, Not recommended for Pulse Laser Use
Fixed ND Filter: 25mm Dia, 0.6, Ge R01802-06 Graph $135.00
Add to cart
Substrate MaterialGermanium
Dimensions25mm Diameter ±0.2mm
Thickness1.0mm ±0.2mm
Bevel45°
Edge FinishGround
Surface Quality (SQ)60-40 Scratch & Dig
Clear Aperture (CA)90%
Centrationn/a
Surface Flatness2 Waves Per 25mm
Transmitted Wavefront Error (TWE)n/a
Parallelism< 7 Arc Minutes
CoatingMetallic ND
Wavelength2.2 to 15 µm
Calibrated Wavelength2.5 µm
Optical Density (OD)0.6 ±5%
Operating Temperature-50° C to 100° C
Beam Deviation< 3 Arcminutes
Laser Damage<30 W/cm² CW, typical, Not recommended for Pulse Laser Use
Fixed ND Filter: 25mm Dia, 1.0, Ge R01803-10 Graph $135.00
Add to cart
Substrate MaterialGermanium
Dimensions25mm Diameter ±0.2mm
Thickness1.0mm ±0.2mm
Bevel45°
Edge FinishGround
Surface Quality (SQ)60-40 Scratch & Dig
Clear Aperture (CA)90%
Centrationn/a
Surface Flatness2 Waves Per 25mm
Transmitted Wavefront Error (TWE)n/a
Parallelism< 7 Arc Minutes
CoatingMetallic ND
Wavelength2.2 to 15 µm
Calibrated Wavelength2.5 µm
Optical Density (OD)1.0 ±5%
Operating Temperature-50° C to 100° C
Beam Deviation< 3 Arcminutes
Laser Damage<30 W/cm² CW, typical, Not recommended for Pulse Laser Use
Fixed ND Filter: 25mm Dia, 2.0, Ge R01804-20 Graph $135.00
Add to cart
Substrate MaterialGermanium
Dimensions25mm Diameter ±0.2mm
Thickness1.0mm ±0.2mm
Bevel45°
Edge FinishGround
Surface Quality (SQ)60-40 Scratch & Dig
Clear Aperture (CA)90%
Centrationn/a
Surface Flatness2 Waves Per 25mm
Transmitted Wavefront Error (TWE)n/a
Parallelism< 7 Arc Minutes
CoatingMetallic ND
Wavelength2.2 to 15 µm
Calibrated Wavelength2.5 µm
Optical Density (OD)2.0 ±5%
Operating Temperature-50° C to 100° C
Beam Deviation< 3 Arcminutes
Laser Damage<30 W/cm² CW, typical, Not recommended for Pulse Laser Use
Fixed ND Filter: 25mm Dia, 3.0, Ge R01805-30 Graph $239.00
Add to cart
Substrate MaterialGermanium
Dimensions25mm Diameter ±0.2mm
Thickness1.0mm ±0.2mm
Bevel45°
Edge FinishGround
Surface Quality (SQ)60-40 Scratch & Dig
Clear Aperture (CA)90%
Centrationn/a
Surface Flatness2 Waves Per 25mm
Transmitted Wavefront Error (TWE)n/a
Parallelism< 7 Arc Minutes
CoatingMetallic ND
Wavelength2.2 to 15 µm
Calibrated Wavelength2.5 µm
Optical Density (OD)3.0 ±5%
Operating Temperature-50° C to 100° C
Beam Deviation< 3 Arcminutes
Laser Damage<30 W/cm² CW, typical, Not recommended for Pulse Laser Use
Fixed ND Filter: 25mm Dia, 4.0, Ge R01806-40 $239.00
Add to cart
Substrate MaterialGermanium
Dimensions25mm Diameter ±0.2mm
Thickness1.0mm ±0.2mm
Bevel45°
Edge FinishGround
Surface Quality (SQ)60-40 Scratch & Dig
Clear Aperture (CA)90%
Centrationn/a
Surface Flatness2 Waves Per 25mm
Transmitted Wavefront Error (TWE)n/a
Parallelism< 7 Arc Minutes
CoatingMetallic ND
Wavelength2.2 to 15 µm
Calibrated Wavelength2.5 µm
Optical Density (OD)4.0 ±5%
Operating Temperature-50° C to 100° C
Beam Deviation< 3 Arcminutes
Laser Damage<30 W/cm² CW, typical, Not recommended for Pulse Laser Use