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| Coad | 669883 | Substrate | Neutral Density Glass | |
| Type | Neutral Density Filter | OD | 2.0±0.10@850nm | |
| Diameter(mm) | 25.40 | Diameter Tolerance | +0.00/-0.25mm | |
| Clear Aperture | >90% | Parallelism | <10 arcsec | |
| Thickness(mm) | <5.0 | Thickness Tolerance | - | |
| Surface Quality | 40-20 | Wavelength(nm) | 700 - 1100 | |
| Surface Flatness | λ/2@633nm | FWHM | - | |
| Transmittance | - | Mechanical Housing | - | |
| Shell Diameter | - | Housing Diameter Tolerance | - | |
| Outer Shell Thickness | - | 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.
LBTEK absorptive neutral density attenuators are made from Schott glass substrates that provide stable absorption across the 700–1100 nm wavelength range. One surface of the substrate is coated with a 700–1100 nm anti-reflection (AR) coating, with the coated side designed as the incident surface to effectively reduce reflected optical power. LBTEK currently offers attenuators with OD values from 0.1 to 6.0, all with a diameter of 25.4 mm. They can be mounted in LBTEK standard lens sleeves, fixed lens holders, or various coaxial mounting plates, allowing customers to choose the most suitable mounting method for different application scenarios. 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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