0.9 OD, 50mm Sq., Precision Anti-Reflection (AR) Coated Absorptive ND Filter

Product Details λ/4 Transmitted Wavefront Distortion AR Coated for 450 – 700nm Optical Densities from 0.1 to 4.0 Available Absorptive Neutral Density (ND) Filters Also Available Precision Anti-Reflection (AR) Coated Absorptive Neutral Density (ND) Filters feature SCHOTT NG Colored Glass substrates that are polished to achieve a transmitted wavefront distortion (TWFD) specification of λ/4. These filters are coated on both surfaces with an anti-reflection (AR) coating from 450 – 700nm, reducing back reflections and enabling filter stacking with less losses and artifacts. Precision Anti-Reflection (AR) Coated Absorptive Neutral Density (ND) Filters are available with optical densities from 0.1 to 4.0 and can be stacked together to achieve custom optical densities to meet application requirements. These neutral density filters are available in 25mm diameter or 50mm square sizes and are ideal for machine vision, imaging, or low power laser applications. Specifications General Type of Filter: Absorptive ND Filter Type: Neutral Density Filter Physical & Mechanical Properties Dimensions (mm): 50.00 x 50.00 +0.00/-0.25 Length (mm): 50.00 Thickness (mm): 1.75 (nominal) Width (mm): 50.00 Clear Aperture (%): 90 Parallelism (arcsec): <30 Optical Properties Optical Density OD (Average): 0.9 ±10% @ 550nm Glass/Filter Number: SCHOTT NG4 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More ND Filter Glass Coating: BBAR (450-700nm) Index of Refraction (n d ): 1.51 Surface Quality: 80-50 Transmission (%): 12.59 Blocking Wavelength Range (nm): 400 - 700 Transmitted Wavefront, P-V: λ/4 Coating Specification: R avg ≤1.0% @ 450 - 700nm @ 0° Material Properties Transformation Temperature (°C): 483 Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 253: Compliant ×