Infrared Neutral Density Filters
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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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