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| Coad | 669773 | Substrate | Neutral Density Glass | |
| Type | Neutral Density Filter | OD | 3.0±0.15@550nm | |
| Diameter(mm) | 25.40 | Diameter Tolerance | +0.00/-0.25mm | |
| Clear Aperture | >90% | Parallelism | <10 arcsec | |
| Thickness(mm) | 1.50 | Thickness Tolerance | - | |
| Surface Quality | 40-20 | Wavelength(nm) | 400 - 650 | |
| Surface Flatness | - | FWHM | - | |
| Transmittance | - | Mechanical Housing | SM1-8A | |
| Shell Diameter | 30.5mm | Housing Diameter Tolerance | +0.00/-0.05mm | |
| Outer Shell Thickness | 12.0mm | Operating Temperature | - | |
| Laser Damage Threshold | 0.33J/cm2@515nm，290fs，20kHz，Ø12.07μm(SinglePulse)0.26J/cm2@515nm，290fs，100Hz，Ø12.07μm(100Pulses) | Transmission Wavefront Deviation | λ/4@633nm | |
| Coating Radial Angle | - | Coating Type | Uncoated | |
| Protective Chamfer | - | AOI | - | |
| Coating Specifications | - | |||
The optical density (OD) of LBTEK absorptive neutral density attenuators ranges from 0.1 to 8.0. They are available in two sizes: circular Ø25.4 mm and square 50.8 mm. 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. The 50.8 mm square version can be mounted using the filter holder (FHM1). Other opto-mechanical mounting options are also available.
The optical density (OD) of LBTEK absorptive neutral density attenuators ranges from 0.3 to 8.0, with a size of 1 inch. These attenuators are made from Schott glass substrates that exhibit stable absorption across the 400–650 nm wavelength range. 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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