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MICRO-CONTROLE / Spectra-Physics
Infrared Neutral Density Filters

Infrared Neutral Density Filters

Product catalog summary

Infrared Neutral Density Filters Overview
These filters are designed to attenuate infrared (IR) radiation within the 2 to 14 µm range, with optimal performance between 2 to 5 µm. They are constructed from germanium substrates and feature a spectrally neutral vacuum-deposited metal alloy reflective coating, ensuring high damage thresholds up to GW/cm².

Specifications

Material: Optical grade germanium or equivalent
Coating: Vacuum deposited metal alloy
Diameter: 25.4 mm ±0.2 mm
Clear Aperture: All but 1.5 mm outer rim
Surface Quality: 80-50 scratch-dig
Thickness: 1 mm ± 0.2 mm
Parallelism: 3 to 5 arc min (0.8 to 1.5 mrad)
Wavelength Range: 2 to 14 µm (optimized for 2 to 5 µm)

Transmittance Characteristics
The typical transmittance of these filters varies with wavelength, with the germanium substrate absorbing strongly below 1.8 µm. The transmittance levels are specified for different optical densities at 3.5 µm.

Ordering Information

Optical Density 0.3: 50% Transmittance, Model FIR-ND03
Optical Density 0.6: 25% Transmittance, Model FIR-ND06
Optical Density 1.0: 10% Transmittance, Model FIR-ND10
Optical Density 2.0: 1.0% Transmittance, Model FIR-ND20
Optical Density 3.0: 0.1% Transmittance, Model FIR-ND30
Set of Filters: FS-IR

Filter Holders
Additional accessories such as the FH-1S Filter Holder are available for these filters, as detailed on page 688.

Catalog excerpts

568 Phone: 1-800-222-6440 • Fax: 1-949-253-1680 O p t i c s ACCESSORIES ULTRAFAST LASER OPTICS HIGH-ENERGY OPTICS DIFFRACTION GRATINGS POLARIZATION OPTICS OPTICAL FILTERS BEAMSPLITTERS WINDOWS Filter Set VersaStar™ Modular Filter Wheel see page 689 FH-2S Filter Holder see page 688 Infrared Neutral Density Filters Optimized for 2 to 5 ìm, these filters attenuate IR radiation from 2 to 14 ìm. These one-inch diameter filters are made from germanium substrates coated with a spectrally neutral vacuum deposited metal alloy reflective coating. • Attenuate IR radiation from 2 to 14 ìm (optimized for 2 to 5 ìm) • Spectrally neutral throughout usable range • High damage threshold, up to GW/cm2 Specifications Material Optical grade germanium or equivalent Coating Vacuum deposited metal alloy Diameter 25.4 mm ±0.2 mm Clear Aperture All but 1.5 mm outer rim Surface Quality 80-50 scratch-dig Thickness 1mm ± 0.2 mm Parallelism 3 to 5 arc min (0.8 to 1.5 mrad) Wavelength Range 2 to 14 ìm (optimized for 2 to 5 ìm) TRANSMITTANCE (%) WAVELENGTH (ìm) 0 20 40 60 2.5 3.0 4.0 5.0 6.0 8.0 10.0 14.0 16.0 ND 0.3 ND 0.6 ND 1 ND 2 Typical transmittance of IR ND Filters. The germanium substrate absorbs strongly Ordering Information below 1.8 ìm. Optical Density Nominal Transmittance at 3.5 ìm Transmittance Tolerance Model 0.3 50% ±3.0% FIR-ND03 0.6 25% ±2.0% FIR-ND06 1.0 10% ±1.5% FIR-ND10 2.0 1.0% ±0.2% FIR-ND20 3.0 0.1% ±0.04% FIR-ND30 Set of Infrared Neutral Density Filters FS-IR Specifications are for the 2 to 5 ìm range. Filter Holders page 688 FH-1S Filter Holder see page 688

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Infrared Neutral Density Filters

Infrared Neutral Density Filters

Catalog excerpts

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