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Fixed ND Filters (Ge)

Fixed ND Filters (Ge)

Fixed 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.

Density Tolerance: ± 5%

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