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Linear Variable Metallic ND Filter, N-BK7, 79.4 x 25.4 mm, 0.08-2 OD
The 31W00ML.1 Linear Variable Metallic ND Filter is a 79.4 x 25.4 mm linear variable metallic ND filter made of N-BK7 glass with an OD of 0.08-2, and surface flatness of ≤2λ. This ND filter provides linearly varying attenuation or beam splitting in the visible and NIR region. Attenuation is achieved by a thin film of aluminum protected with an overcoat, and variable beam splitting is an added benefit of the inherent reflectivity of aluminum. The N-BK7 substrate has a slight wedge between the faces to eliminate unwanted fringe patterns and cavity feedback, and the rear surface is also antireflection coated for the broadband visible range.
Specifications
- Size79.4 x 25.4 mm
- Wavelength Range430-700 nm
- Optical Density0.08 - 2
- Optical Density Tolerance±5%
- MaterialN-BK7
- Damage Threshold75 W/cm2 CW, 10 mJ/cm2 with 10 nsec pulses at 1064 nm, typical
- Size Tolerance+0/-0.25 mm
- Thickness3.18 mm
- Thickness Tolerance+0/-0.76 mm
- Surface Flatness≤2λ
- Surface Quality40-20 scratch-dig
- Clear Aperture≥central 90% of length and 80% of width
- Wedge15 ±5 arc min
- Chamfers0.25–0.76 mm face width
- Chamfers Angle Tolerance45° ±15°
- DurabilityMetalized area MIL-M-13508C, AR coated area MIL-C-675, moderate abrasion
- Cleaning
Resources & Downloads
2D Product Drawings
METALLIN-ATT-S(68.4 kB, PDF)
Other
31W00ML.1_ROHS(147.3 kB, PDF)
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