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Neutral Density Neutral Density Filters have flat spectral response curves allowing them to uniformly reduce the amount of light allowed through regardless of wavelength. The spectral distribution therefore does not change or get distorted through a neutral density filter. Most neutral density filters are flat in the visible spectrum, but are non-linear in the UV and IR regions. All of the ND filters listed here have a metallic coating to reflect back light rather than absorbing it (for better thermal resistance). They also include a frame to fit inside Sciencetech FH filter box holder. Four types of filter are available: Extended Range, Fused Silica, Glass and Large Glass.Sciencetech offers Extended Range Neutral Density Filters which have a flat spectral response curve from 250-2000nm, allowing them to be used for solar simulator and other spectroscopic applications where preservation of the UV and near-IR spectrum is also important. These extended range neutral density are made of fused silica glass 50 x 50 x 1.5mm (±0.5mm) Square. 50mm diameter filters are also available upon request. Fused Silica based Neutral Density Filters are used to uniformly reduce the amount of light across the UV, visible and near-IR spectrum that pass through it. These filters are made of thin film fused silica 50 x 50 x 1.5mm (±0.5mm). Since the unwanted light is reflected and not absorbed, these filters can withstand higher light throughput and up to 150°C. Glass based Neutral Density Filters are used to uniformly reduce the amount of light across the visible and near-IR spectrum. These filters are made of thin film glass 50 x 50 x 2mm (±0.5mm). Since the unwanted light is reflected and not absorbed, the filter can withstand higher light throughput and up to 150°C. Large Glass Neutral Density Filters are used to uniformly reduce the amount of light across the visible and near-IR spectrum that pass through it (350-2000nm) . This glass substrate 3" x 3" (76.2 x 76.2mm) square neutral density filter is designed for use with Sciencetech's fully reflective "SS" solar simulators (150-1,600W) and Sciencetech's SF-150 solar simulators. Filter Stacking Since the filters are metallic coated to reflect unwanted light, stacking filters in series to increase total optical density is not recommended due to the combined reflection of the filters on each other. UV Applications The fused silica substrate of these neutral density filters allow them to be used in UV applications.
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