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| Coad | 669860 | Substrate | Neutral Filter Glass | |
| Type | Neutral Density Filter | OD | 4.0±0.20@850nm | |
| Diameter(mm) | 25.40 | Diameter Tolerance | +0.00/-0.25mm | |
| Clear Aperture | >90% | Parallelism | <10 arcsec | |
| Thickness(mm) | 2.57 | Thickness Tolerance | - | |
| Surface Quality | 40-20 | Wavelength(nm) | 700 - 1100 | |
| Surface Flatness | λ/2@633nm | FWHM | - | |
| Transmittance | - | Mechanical Housing | SM1-8A（透镜套筒，SM1内外螺纹） | |
| Shell Diameter | 30.5mm | Housing Diameter Tolerance | +0.00/-0.05mm | |
| Outer Shell Thickness | 12.0mm | Operating Temperature | - | |
| Laser Damage Threshold | - | Transmission Wavefront Deviation | - | |
| Coating Radial Angle | - | Coating Type | AR Coating | |
| Protective Chamfer | - | AOI | 6° | |
| Coating Specifications | Ravg<0.5%@700-1100nm,AOI=6° | |||
The optical density (OD) of LBTEK absorptive neutral density attenuators with a 700–1100 nm anti-reflection (AR) coating ranges from 0.1 to 6.0. The AR coating effectively reduces reflected optical power. These attenuators are circular with a diameter of Ø25.4 mm, and their thickness depends on the material and optical density (OD). The Ø25.4 mm version can be mounted on threaded sleeves or on a 30 mm coaxial mounting plate (OPM-12.5BS) for use within LBTEK’s coaxial systems. Additional opto-mechanical mounting options are also available.
The optical density (OD) of LBTEK absorptive neutral density attenuators ranges from 0.1 to 6.0, with a size of 1 inch and a 700–1100 nm anti-reflection (AR) coating. The MNDFA series absorptive neutral density attenuators are pre-mounted in removable standard lens sleeves, with product model, operating wavelength, and OD value engraved on the housing for easy identification. Note: The thickness of absorptive neutral density filters is for reference only; the actual thickness depends on the optical density of the specific glass batch used.
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